Diskrete Technische Mathematik Universität Braunschweig Vorträge

Diskrete
Mathematik
Technische
Universität
Braunschweig
Prof. Dr. H. Harborth
h.harborth@tu-bs.de
Pockelsstraße 14
Raum 402
38106 Braunschweig
Tel: +49-531-391-7515
Braunschweig, 14. Dezember 2015
Vorträge — Talks
1966
1. Braunschweig — 20. 1. 1966
Die zahlentheoretische Funktion g(n) und Beispiele.
Kolloquium über Rechentechnik, TH Braunschweig.
1968
2. Oberwolfach — 26. 3. 1968
Aufeinanderfolgende, zu n nicht teilerfremde Zahlen.
Mathematisches Forschungsinstitut, Tagung Zahlentheorie.
3. Linz, Österreich — 19. 9. 1968
Anzahlen von Diagonalschnittpunkten und Teilflächen im regulären
n-Eck.
ÖMG-Tagung.
1969
4. Calgary, Alberta, Canada — 10. 6. 1969
On the number of intersections of diagonals in regular n-gons.
International Conference on Combinatorial Structures and their Applications.
University of Calgary.
5. Oberwolfach — 1. 7. 1969
Über die Schnittpunktanzahl vollständiger, n-geteilter Graphen.
Mathematisches Forschungsinstitut, Tagung Graphentheorie.
6. Darmstadt — 24. 9. 1969
Über ein kombinatorisches Problem von H. Steinhaus.
DMV-Tagung.
1970
7. Oberwolfach — 17. 3. 1970
Sequenzen ganzer Zahlen.
Mathematisches Forschungsinstitut, Tagung Zahlentheorie.
1
8. Darmstadt — 30. 4. 1970
Kreuzungsprobleme bei Graphen.
Kolloquium über Didaktik der Mathematik, TH Darmstadt.
1972
9. Bonn — 4. 2. 1972
Über einige 0-1-Probleme.
Mathematisches Kolloquium, Institut für Angewandte Mathematik und
Informatik der Universität Bonn.
10. Clausthal-Zellerfeld — 3. 6. 1972
Alternierende Teilblöcke von endlichen 0-1-Folgen.
Niedersächsisches Mathematik-Kolloquium.
11. Braunschweig — 5. 7. 1972
Mengen von Punkten mit rationalen Abständen.
Habilitations-Kolloquium vor der Fakultät der TH Braunschweig.
12. Braunschweig — 13. 7. 1972
Gerade und ungerade Pascal-Zahlen.
Öffentliche Probevorlesung an der TH Braunschweig.
13. Bochum — 28. 9. 1972
Über endliche 0-1-Folgen mit gleichen Teilfolgen.
DMV-Tagung.
14. Oberwolfach — 17. 10. 1972
Über endliche Zeichenfolgen mit vorgegebenen Teilblöcken.
Mathematisches Forschungsinstitut, Tagung Angewandte Kombinatorik.
1973
15. Oberwolfach — 26. 3. 1973
Ein Gitterpunkt-Problem.
Mathematisches Forschungsinstitut, Tagung Reine Kombinatorik.
16. Aachen — 19. 6. 1973
Ein Extremalproblem für Gitterpunkte.
Mathematisches Kolloquium der TH Aachen.
17. Wien, Österreich — 17. 9. 1973
Parität von Kreuzungszahlen vollständiger, n-geteilter Graphen.
ÖMG-Tagung.
1974
18. Vancouver, British Columbia, Canada — 21. 8. 1974
On drawings of the complete graphs in the plane.
Internationaler Mathematiker-Kongreß.
2
19. Hannover — 27. 9. 1974
Teilbarkeitseigenschaften im Pascal-Dreieck.
DMV-Tagung.
1975
20. Oberwolfach — 14. 7. 1975
Extremale Polyominoes.
Mathematisches Forschungsinstitut, Tagung Graphentheorie.
21. Hannover — 11. 12. 1975
Bemerkungen zum Pascalschen Zahlendreieck.
Kolloquium für Didaktik der Mathematik, TU Hannover.
1976
22. Kesztheley, Ungarn — 2. 7. 1976
Crossings on edges in drawings of complete multipartite graphs.
Fifth Hungarian Colloquium on Combinatorics.
1977
23. Egham, England — 13. 7. 1977
Venn diagrams for multiples of four numbers.
Sixth British Combinatorial Conference, Royal Holloway College, University of
London.
24. Oberwolfach — 11. 8. 1977
Über die Existenz von Kreuzungszahlen für den vollständigen
Graphen.
Mathematisches Forschungsinstitut, Tagung Graphentheorie.
25. Salzburg, Österreich — 28. 9. 1977
Ein Extremalproblem für Matrizen aus Nullen und Einsen.
ÖMG-Tagung.
1978
26. Siegen — 28. 6. 1978
Konvexe Vielecke in ebenen Punktmengen.
Geometrie-Symposium, Universität Siegen.
27. Oberwolfach — 2. 11. 1978
Teilbarkeitsprobleme im Pascalschen Dreieck.
Mathematisches Forschungsinstitut, Tagung Elementare Zahlentheorie.
1979
28. Hamburg — 19. 3. 1979
Über spezielle 0-1-Folgen.
Kolloquium der Fachbereiche Maschinenbau/Elektrotechnik, Hochschule der
Bundeswehr.
3
29. Oberwolfach — 7. 8. 1979
Bemerkungen zu kleinen Ramsey-Zahlen.
Mathematisches Forschungsinstitut, Tagung Graphentheorie.
30. Cambridge, England — 16. 8. 1979
Some bipartite Ramsey numbers.
Seventh British Combinatorial Conference.
1980
31. Kalamazoo, Michigan, USA — 8. 5. 1980
The Ramsey number r(K4 − x, K5 ).
Fourth International Conference on the Theory and Applications of Graphs,
Western Michigan University.
32. Hohenheim — 3. 7. 1980
Animals, Polyominoes oder das Zellwachsproblem.
Mathematisch-Biometrisches Kolloquium der Universität Hohenheim.
33. Dortmund — 18. 9. 1980
Lagerung von Quadraten in Quadraten.
DMV-Tagung.
1981
34. Eger, Ungarn — 1981
Two-colorings of simple arrangements.
Sixth Hungarian Colloquium on Combinatorics.
35. Oberwolfach — 17. 7. 1981
(1) Simple arrangements of straight lines in the plane. — (2) Point
sets with equal numbers of unit distant neighbors.
Mathematisches Forschungsinstitut, Tagung Diskrete Geometrie.
36. Bielefeld — 14. 11. 1981
Zur Anzahl der durch n Punkte bestimmten Richtungen.
Kolloquium über Kombinatorik.
1982
37. Oberwolfach — 2. 6. 1982
Mosaikgraphen.
Mathematisches Forschungsinstitut, Tagung Graphentheorie.
38. Siegen — 15. 7. 1982
Kombinatorisches mit Punkten, Geraden und Kreisen.
III. Geometrie-Symposium, Universität Siegen.
39. Salzburg, Österreich — 7. 10. 1982.
Polyominoes.
Mathematisches Kolloquium der Universität Salzburg.
4
40. Ilmenau — 26. 10. 1982
Polyominoes.
27. Internationales Wissenschaftliches Kolloquium der TH Ilmenau.
41. Bielefeld — 16. 11. 1982
Dreiecke und Vierecke in Anordnungen von Pseudogeraden.
Kolloquium über Kombinatorik.
1983
42. Siófok, Ungarn — 10. 5. 1983
Packing problems of regular pentagons.
Zweite Österreichisch-Ungarische Geometrie-Tagung.
43. Southampton, England — 15. 7. 1983
Mosaic graphs.
Ninth British Combinatorial Conference, University of Southampton.
44. Köln — 23. 9. 1983
Reguläre Punktmengen mit Einheitsabständen.
DMV-Tagung.
45. Karl-Marx-Stadt — 14. 10. 1983.
Äquidistante, reguläre Punktmengen.
2. Kolloquium Geometrie und Kombinatorik.
46. Odense, Dänemark — 24. 11. 1983.
Drawings of graphs.
Mathematisches Kolloquium der Universität Odense.
1984
47. Kalamazoo, Michigan, USA — 7. 6. 1984
Drawings of graphs and multiple crossings.
Fifth International Conference on the Theory and Applications of Graphs,
Western Michigan University.
48. Oberwolfach — 13. 7. 1984
Multiple crossings in drawings of graphs.
Mathematisches Forschungsinstitut, Tagung Graphentheorie.
49. Oberwolfach — 27. 9. 1984
Point sets with many unit circles.
Mathematisches Forschungsinstitut, Tagung Kombinatorische Geometrie.
50. Braunschweig — 2. 11. 1984
Vollkommene Zahlenpaare.
Mathematisches Kolloquium zum 70. Geburtstag von Prof. Dr. H.-J. Kanold, TU
Braunschweig.
51. Bielefeld — 20. 11. 1984
Reguläre Kugelpackungen.
Kolloquium über Kombinatorik.
5
52. Kiel — 23. 11. 1984
Darstellungen von Graphen in der Ebene.
Mathematisches Kolloquium der PH Kiel.
1985
53. Hamburg — 29. 1. 1985
Ramsey-Zahlen.
Mathematisches Kolloquium der Universität Hamburg.
54. Braunschweig — 1. 4. 1985
Probleme der Kombinatorischen Geometrie.
MNU-Tagung, TU Braunschweig.
55. Kiel — 2. 4. 1985
Darstellungen von Graphen in der Ebene.
Tagung zum 75. Geburtstag von Klaus Wagner.
56. Siófok, Ungarn — 13. 5. 1985
Regular point sets with unit distances.
Intuitive Geometry.
57. Salzburg, Österreich — 23. 5. 1985
Einheitskreise in ebenen Punktmengen.
Colloquium on Discrete Geometry.
58. Graz, Österreich — 17. 9. 1985
Ramsey numbers for graphs with five vertices.
ÖMG-Tagung.
59. Bielefeld — 19. 11. 1985
Ramsey-Zahlen für Graphen mit fünf Knoten.
Kolloquium über Kombinatorik.
1986
60. Oberwolfach — 23. 1. 1986
Steinhaus triangles.
Mathematisches Forschungsinstitut, Tagung Kombinatorik.
61. Rostock — 8. 5. 1986
Darstellung von Graphen.
Mathematisches Kolloquium, Universität Rostock.
62. Berlin — 6. 6. 1986
Einheitsabstände in ebenen Punktmengen.
Mathematisches Kolloquium der FU Berlin.
63. Oberwolfach — 1. 7. 1986
The Ramsey number of K5 − e.
Mathematisches Forschungsinstitut, Tagung Graphentheorie.
6
64. Siegen — 5. 7. 1986
Regular packings of spheres.
Geometry Symposium, Universität Siegen.
65. Calgary, Alberta, Canada — 29. 7. 1986
Match sticks in the plane.
The Eugene Strens Memorial Conference on Intuitive and Recreational
Mathematics and its History. University of Calgary.
66. Berkeley, California, USA — 8. 8. 1986
Ramsey numbers for graphs with five vertices.
International Congress of Mathematicians.
67. San Jose, California, USA — 15. 8. 1986.
Fermat-like binomial equations.
Second International Conference on Fibonacci Numbers and their Applications.
68. Marburg — 15. 9. 1986
Universale Überdeckungen der Ebene mit 0-1-Blöcken.
DMV-Tagung.
69. Braunschweig — 18. 9. 1986
Spielerische Mathematik.
MNU-Bezirk Braunschweig, Jugenddorf-Christopherusschule.
70. Bielefeld — 18. 11. 1986
Kongruente gleichseitige Dreiecke in der Ebene.
Kolloquium über Kombinatorik.
1987
71. Haifa, Israel — 25. 3. 1987
Integral drawings of the platonic solids.
Fifth International Conference on Geometry, University of Haifa.
72. Jerusalem, Israel — 30. 3. 1987
Simple figures in combinatorial geometry.
Mathematical Colloquium of the Hebrew University of Jerusalem.
73. Oberwolfach — 11. 6. 1987
Packings with regular n-gons.
Mathematisches Forschungsinstitut, Tagung Diskrete Geometrie.
74. Dortmund — 17. 6. 1987
Integral drawings of planar graphs.
Third International Conference on Discrete Mathematics, Universität Dortmund.
75. London, England — 17. 7. 1987
The Ramsey number of K4 versus K5 − e.
Eleventh British Combinatorial Conference, Goldsmiths’ College, London.
7
76. Karl-Marx-Stadt — 10. 9. 1987
Konvexe Vielecke in Punktmengen.
3. Kolloquium Geometrie und Kombinatorik, TU Karl-Marx-Stadt.
77. Berlin — 25. 9. 1987
Leere Kreise in Darstellungen vollständiger Graphen.
DMV-Tagung.
78. Bielefeld — 29. 11. 1987
Kreuzungsanzahlen für vollständige Graphen.
Kolloquium über Kombinatorik.
1988
79. Memphis, Tennessee, USA — 9. 2. 1988
Drawings of graphs in the plane.
Mathematical Department, Memphis State University.
80. Baton Rouge, Louisiana, USA — 15. 2. 1988
Drawings of the cycle graph.
Nineteenth Southeastern International Conference on Combinatorics, Graph
Theory, and Computing.
81. Point Lookout, Missouri, USA — 25. 2. 1988
Challenging unsolved problems.
The School of the Ozarks, Point Lookout, Missouri.
82. Kalamazoo, Michigan, USA — 2. 6. 1988
The Ramsey number of K3,3 .
Sixth International Conference on the Theory and Applications of Graphs,
Western Michigan University.
83. Pisa, Italien — 28. 7. 1988
Concentric cycles in mosaic graphs.
Third International Conference on Fibonacci Numbers and their Applications.
84. Greifswald — 8. 9. 1988
Ebene Darstellungen von Graphen.
Mathematisches Kolloquium der Universität Greifswald.
85. Wustrow — 12. 9. 1988
Gerade Kreise in Darstellungen von vollständigen Graphen.
Seventh Fischland-Colloquium Discrete Mathematics and Applications.
86. Regensburg — 20. 9. 1988
Zerlegungen von Darstellungen des K2n+1 in gerade Kreise.
DMV-Tagung.
87. Ilmenau — 26. 10. 1988
Darstellungen des vollständigen Graphen ohne Kanten mit wenigen
Kreuzungen.
33. Internationales Wissenschaftliches Kolloquium, TH Ilmenau.
8
88. Bielefeld — 16. 11. 1988
Ramsey numbers for complete bipartite graphs.
Kolloquium über Kombinatorik.
1989
89. Boca Raton, Florida, USA — 24. 2. 1989
Numbers of nonisomorphic drawings for small graphs.
Twentieth Southeastern Conference on Combinatorics, Graph Theory, and
Computing.
90. Shijiazhuang, China — 30. 3. 1989
On drawings of graphs in the plane.
Chinese-German Conference on Combinatorics.
91. Dortmund — 18. 5. 1989
Cycles in drawings of Eulerian graphs.
Fourth International Conference on Discrete Mathematics.
92. Enschede, Niederlande — 25. 5. 1989
Nonisomorphic drawings of graphs.
Twente Workshop on Graphs and Combinatorial Optimization.
93. Norwich, England — 3. 7. 1989
Some mosaic polyominoes.
Twelfth British Combinatorial Conference.
94. Brisbane, Australien — 11. 7. 1989
Minimum sets of partial polyominoes.
Fifteenth Australasian Conference: Combinatorial Mathematics and Computing.
95. San Francisco, California, USA — 28. 7. 1989
On Ramsey numbers of K2,n .
Second International Conference in Graph Theory, Combinatorics, Algorithms,
and Applications.
96. Oberwolfach — 15. 8. 1989
Ganzzahlige Abstände in Punktmengen.
Mathematisches Forschungsinstitut, Tagung Kombinatorische und
reell-algebraische Geometrie.
97. Calgary, Alberta, Canada — 5. 10. 1989
Geometric graphs.
Colloquium, University of Calgary.
98. Memphis, Tennessee, USA — 9. 10. 1989
Integral representations of graphs.
Colloquium, Memphis State University.
99. Hohenheim — 20. 10. 1989
Über Abstände in ebenen Punktmengen.
Kolloquium zum 60. Geburtstag von Prof. Dr. G. Bach, Universität Hohenheim.
9
100. Ulm — 17. 11. 1989
Graphen in der Ebene.
Mathematisches Kolloquium der Universität Ulm.
101. Bielefeld — 22. 11. 1989
Regular drawings of the cycle graph.
Kolloquium über Kombinatorik.
1990
102. Boca Raton, Florida, USA — 16. 2. 1990
Straight ahead cycles in drawings of Eulerian graphs.
Twentyfirst Southeastern Conference on Combinatorics, Graph Theory, and
Computing, Florida Atlantic University.
103. Auburn, Alabama, USA — 19. 2. 1990
Graphs with integral edge lengths.
Mathematical Colloquium, Auburn University.
104. Oxford, Mississippi, USA — 21. 2. 1990.
Some problems on drawing graphs.
Mathematical Colloquium, University of Mississippi (Ole Miss).
105. Eisenach — 16. 3. 1990
Regular cycle drawings.
Tagung Discrete Mathematics.
106. Neubrandenburg — 26. 3. 1990
Extremal sets of snake polyominoes.
Combinatorial Methods and Applications II.
107. Rostock — 27. 4. 1990
Realisierung von Graphen mit ganzzahligen Kanten.
Mathematisches Kolloquium, Universität Rostock.
108. Utrecht, Niederlande — 10. 5. 1990.
Integral realizations of graphs.
Informatik-Kolloquium, Reichsuniversität Utrecht.
109. Malta — 29. 5. 1990
Some chromatic numbers of distance graphs. The First Malta Conference
on Graphs and Combinatorics.
110. Oberwolfach — 7. 6. 1990
Crossing problems in drawings of graphs.
Mathematisches Forschungsinstitut, Tagung Graphentheorie.
111. Magdeburg — 13. 6. 1990
Graphen mit ganzzahligen Kanten.
Mathematisches Kolloquium der Technischen Universität Magdeburg.
10
112. Hindsgavl, Dänemark — 3. 7. 1990
Representations of the Petersen graph.
Julius Petersen Graph Theory Conference.
113. Clemson, South Carolina, USA — 27. 7. 1990
Crossing problems for plane drawings of graphs.
Mathematical Colloquium, Clemson University.
114. Winston-Salem, North Carolina, USA — 30. 7. 1990
Fibonacci representations of graphs.
Fourth International Conference on Fibonacci Numbers and their Applications,
Wake Forest University.
115. Winston-Salem, North Carolina, USA — 31. 7. 1990
Fibonacci and b-adic trees in mosaic graphs.
Fourth International Conference on Fibonacci Numbers and their Applications,
Wake Forest University.
116. Bremen — 20. 9. 1990
Chromatische Zahlen für lineare Abstandsgraphen.
DMV-Tagung.
117. Cincinnati, Ohio, USA — 5. 10. 1990
Integral graph representations.
Mathematical Colloquium, University of Cincinnati.
118. Detroit, Michigan, USA — 6. 10. 1990
Some crossing problems for drawings of graphs.
Midwest Graph Theory Conference XVI, Wayne State University.
119. Fort Wayne, Indiana, USA — 8. 10. 1990
Point sets with integral distances.
Mathematical Colloquium, Indiana and Purdue University Fort Wayne.
120. Terre Haute, Indiana, USA — 10. 10. 1990
Integral edge realizations.
Mathematical Colloquium, Indiana State University Terre Haute.
121. Hannover — 19. 10. 1990.
Probleme bei Darstellungen von Graphen.
Mathematisches Kolloquium zum 80. Geburtstag von Prof. Dr. Theodor Kaluza,
Universität Hannover.
122. Bielefeld — 21. 11. 1990
Das Esther Klein Problem für Darstellungen des vollständigen
Graphen.
Kolloquium über Kombinatorik.
1991
123. Budapest, Ungarn — 24. 1. 1991
Ramsey numbers for graph sets with fixed numbers of edges.
International Conference on Sets, Graphs, and Numbers.
11
124. Baton Rouge, Louisiana, USA — 13. 2. 1991.
Maximum number of crossings for the cube graph.
Twentysecond Southeastern Conference on Combinatorics, Graph Theory, and
Computing.
125. Evansville, Indiana, USA — 18. 2. 1991
Numbers of crossings for drawings of graphs.
Mathematical Colloquium, University of Evansville.
126. Urbana-Champaign, Illinois, USA — 21. 2. 1991
Graph drawings in the plane.
Mathematical Colloquium, University of Illinois at Urbana-Champaign.
127. Potsdam — 27. 3. 1991
Neuere Ergebnisse in der Graphentheorie.
Mathematisches Kolloquium der Brandenburgischen Landeshochschule.
128. Banff, Alberta, Canada — 30. 4. 1991
Ramsey numbers for five vertex graph sets with fixed number of edges.
Conference on Finite and Infinite Combinatorics in Sets and Logic.
129. Enschede, Niederlande — 22. 5. 1991
Maximum numbers of crossings.
Second Twente Workshop on Graphs and Combinatorial Optimization.
130. Hildesheim — 8. 6. 1991
Kleine Ramsey-Zahlen.
Niedersächsisches Mathematik Kolloquium.
131. Bled, Slovenia (Yugoslavia) — 25. 6. 1991
Graph drawings with straight ahead Eulerian cycles.
Workshop on Algebraic and Topological Methods in Graph Theory.
132. Guildford, Surrey, England — 11. 7. 1991
Ramsey numbers for sets of small graphs.
Thirteenth British Combinatorial Conference.
133. Johannesburg, South Africa — 19. 7. 1991
Small Ramsey numbers.
Mathematical Colloquium, Rand Afrikaans University.
134. Durban, South Africa — 23. 7. 1991
Crossing regular cycle drawings.
255th Anniversary of Graph Theory.
135. Szeged, Ungarn — 2. 9. 1991
Newtonian numbers for overlapping circular disks.
Conference on Intuitive Geometry.
136. Dortmund — 12. 9. 1991
Special crossing problems for graph drawings.
Fifth International Conference on Discrete Mathematics.
12
137. Bielefeld — 19. 9. 1991
Kreuzungsreguläre Darstellungen des Kreisgraphen.
DMV-Tagung.
138. Calgary, Alberta, Canada — 17. 10. 1991.
Crossings in drawings of graphs.
Mathematical Colloquium, University of Calgary.
139. Fargo, North Dakota, USA — 25. 10. 1991
Crossings on edges in graph drawings.
AMS-Meeting 869, Fargo, North Dakota.
1992
140. Kiel — 24. 1. 1992
Über das Esther-Klein-Problem.
Mathematisches Kolloquium der PH Kiel.
141. Boca Raton, Florida, USA — 4. 2. 1992
Drawings of the complete graph with maximum number of crossings.
Twentythird Southeastern Conference on Combinatorics, Graph Theory, and
Computing.
142. Ilmenau — 26. 3. 1992
Complete graph drawings with a maximum number of crossings.
Ehrenkolloquium anläßlich des 65. Geburtstages von Prof. Dr. Horst Sachs.
143. Nahsholim, Israel — 30. 3. 1992
Small point sets with fixed number of distances.
Sixth International Conference on Geometry, University of Haifa.
144. Kalamazoo, Michigan, USA — 5. 6. 1992
Maximum number of crossings in drawings of small graphs.
Seventh International Conference on Graph Theory, Combinatorics, Algorithms,
and Applications, Western Michigan University.
145. Dayton, Ohio, USA — 8. 6. 1992
Extremal point sets in the plane.
Mathematics and Statistics special Colloquium, Wright State University.
146. St. Andrews, Scotland — 20. 7. 1992
Fibonacci and b-adic tree representations by regular k-gons.
Fifth International Conference on Fibonacci Numbers and their Applications.
147. Aberdeen, Scotland — 27. 7. 1992
Some Ramsey problems.
Mathematical Colloquium, University of Aberdeen.
148. Acireale, Sicily, Italy — 10. 9. 1992
Cube graph Ramsey numbers.
Third Catania Combinatorial Conference.
13
149. Berlin — 17. 9. 1992
Ramseyzahlen für Würfelgraphen.
DMV-Tagung.
150. Berlin — 18. 9. 1992
Punktmengen mit wenigen Abständen.
DMV-Tagung.
151. Carbondale, Illinois, USA — 14. 10. 1992
Variations of the Esther Klein problem.
CCC 92 — Seventh Midwest Conference on Combinatorics, Cryptography, and
Computing, Southern Illinois University.
152. Oberwolfach — 3. 11. 1992
Finite Ramsey problems.
Mathematisches Forschungsinstitut, Tagung Kombinatorik.
1993
153. Aachen — 12. 2. 1993
Das Happy-End-Problem von Erdős/Szekeres.
Mathematisches Kolloquium, Walter Oberschelp 60 Jahre, RWTH Aachen.
154. Boca Raton, Florida, USA — 22. 2. 1993
Ramsey colorings for diagonals of convex polygons.
Twentyfourth Southeastern Conference on Combinatorics, Graph Theory, and
Computing.
155. Normal, Illinois, USA — 2. 3. 1993
Some graph drawing problems.
Colloquium, Mathematics Department, Illinois State University.
156. Evansville, Indiana, USA — 4. 3. 1993
On Ramsey numbers.
University of Evansville.
157. Siegen — 11. 5. 1993
Abstände in Punktmengen.
Mathematisches Kolloquium.
158. Hannover — 14. 5. 1993.
Gleiche Abstände in ebenen Punktmengen.
Sitzung der Braunschweigischen Wissenschaftlichen Gesellschaft.
159. Enschede, Niederlande — 2. 6. 1993
Cube graphs without squares.
Third Twente Workshop on Graphs and Combinatorial Optimization.
160. Keele, Staffordshire, England — 6. 7. 1993
Cube graph Ramsey numbers.
Fourteenth British Combinatorial Conference.
14
161. Keszthely, Ungarn — 21. 7. 1993
Some exact maximum numbers of equal distances.
Combinatorics, Paul Erdős is Eighty.
162. Budapest, Ungarn — 27. 7. 1993
On distances in point sets.
Second Geometry Festival.
163. Linz, Österreich — 21. 9. 1993
Cube subgraphs without squares.
XIII. Österreichischer Mathematikerkongreß.
164. Chiang Mai, Thailand — 27. 10. 1993
Small numbers for Ramsey problems.
International Workshops and Conference, Chiang Mai University.
1994
165. Darmstadt — 26. 1. 1994
Kombinatorik der Abstände in ebenen Punktmengen.
Mathematisches Kolloquium.
166. Boca Raton, Florida, USA — 9. 3. 1994
Minimum number of edges with at most s crossings in drawings of the
complete graph.
Twentyfifth Southeastern Conference on Combinatorics, Graph Theory, and
Computing.
167. Braunschweig — 18. 5. 1994
Mathematik, Zahl und Architektur.
Institut für Bau- und Stadtbaugeschichte, Technische Universität Braunschweig.
168. Oberwolfach — 24. 5. 1994
Few distances in small point sets.
Mathematisches Forschungsinstitut, Tagung Discrete Geometry.
169. Oberwolfach — 29. 6. 1994
Drawings of the cycle graph.
Mathematisches Forschungsinstitut, Tagung Graphentheorie.
170. Pullman, Washington, USA — 18. 7. 1994
Rado numbers of Fibonacci sequences and a problem of S. Rabinowitz.
Sixth International Conference on Fibonacci Numbers and their Applications.
171. Dortmund — 26. 7. 1994
Around the Esther Klein problem.
Sixth International Conference on Discrete Mathematics, Universität Dortmund.
172. Duisburg — 22. 9. 1994
Zero-sum Ramsey-Zahlen modulo 3.
DMV-Tagung.
15
173. Hamburg — 16. 11. 1994
Smallest nonmeshy trees.
Kolloquium über Kombinatorik.
1995
174. Boca Raton, Florida, USA — 9. 3. 1995
Rado numbers for homogeneous second order linear recurrences —
degree of partition regularity.
Twentysixth Southeastern Conference on Combinatorics, Graph Theory, and
Computing.
175. Aachen — 20. 3. 1995
Integral distances in point sets.
Colloquium Carolus Magnus.
176. Enschede, Niederlande — 8. 6. 1995
Path and cycle drawings.
4th Twente Workshop on Graphs and Combinatorial Optimization.
177. Hamburg — 3. 7. 1995
Crossing regular drawings of graphs.
The Third International Congress on Industrial and Applied Mathematics
(ICIAM 95).
178. Burlington, Vermont, USA — 5. 8. 1995
Problems in topological graph theory.
Workshop, University of Vermont, Burlington, VT.
179. Burlington, Vermont, USA — 7. 8. 1995
Maximum crossing numbers.
Mathfest, AMS-MAA, Burlington, VT.
180. Burlington, Vermont, USA — 7. 8. 1995
Cube Ramsey numbers.
Mathfest, AMS-MAA, Burlington, VT.
181. Budapest, Ungarn — 8. 9. 1995.
Esther Klein for six points in case of pentagonal convex hulls.
International Conference on Intuitive Geometry.
182. Winnipeg, Manitoba, Canada — 30. 9. 1995
Non-existence of Fibonacci triangles.
Twenty-fifth Manitoba Conference on Combinatorial Mathematics and
Computing.
1996
183. Baton Rouge, Louisiana, USA — 21. 2. 1996
Smallest nonmeshy trees.
27th Southeastern Conference an Combinatorics, Graph Theory, and Computing.
16
184. Braunschweig — 8. 3. 1996
Kreuzungsprobleme für Graphen.
Plenum der Braunschweigischen Wissenschaftlichen Gesellschaft.
185. Braunschweig — 23. 4. 1996
Platonische Körper.
Didaktisches Kolloquium Mathematik an der Technischen Universität Braunschweig.
186. Elgersburg, Thüringen — 8. 5. 1996
Empty triangles in drawings of the complete graph.
Conference on Graph Theory.
187. Memphis, Tennessee, USA — 23. 5. 1996
Some open graph drawing problems.
The University of Memphis.
188. Oxford, Mississippi, USA — 24. 5. 1996
Achievement games for animals.
Ninth Cumberland Conference on Graph Theory, Combinatorics, and
Computing, The University of Mississippi.
189. Kalamazoo, Michigan, USA — 4. 6. 1996
Chess pieces on triangular honeycombs.
Eighth International Conference on Graph Theory, Combinatorics, Algorithms,
and Applications, Western Michigan University.
190. Graz, Österreich — 18. 7. 1996
Smallest integral combinatorial box.
Seventh International Conference on Fibonacci Numbers and their Applications.
191. Graz, Österreich — 19. 7. 1996
Smallest nonmeshy trees in triangular and hexagonal lattices.
Seventh International Conference on Fibonacci Numbers and their Applications.
192. Budapest, Ungarn — 30. 7. 1996
Packings of congruent polygons.
3rd Geometry Festival.
193. Cottbus — 26. 11. 1996
Kantenkreuzungen für Graphen.
Mathematisches Kolloquium, Brandenburgische Technische Universität Cottbus.
194. Siegen — 10. 12. 1996
Kreuzungen in Darstellungen von Graphen.
Mathematisches Kolloquium, Universität Siegen.
1997
195. Boca Raton, Florida, USA — 5. 3. 1997
Independent knights on triangular boards.
28th Southeastern Conference on Combinatorics, Graph Theory, and Computing.
17
196. Evansville, Indiana, USA — 19. 3. 1997
The Esther Klein or Happy End problem.
Math Club, University of Evansville.
197. Memphis, Tennessee, USA — 22. 3. 1997
Ramsey colorings for diagonals of convex sets.
AMS-meeting 919, University of Memphis.
198. Potsdam — 1. 4. 1997
Minimum integral combinatorial box.
Potsdamer Geometrie Tagung.
199. Dörnfeld (Ilmenau) — 9. 4. 1997
Hexagonal Polyomino achievement.
International Colloquium on Graph Theory in Honour of Horst Sachs on the
occasion of his 70th birthday.
200. Oshkosh, Wisconsin, USA — 10. 5. 1997
Two-circle drawings of graphs.
27th Midwest Graph Theory Conference (MIGHTY XXVII), University of
Wisconsin.
201. Atlanta, Georgia, USA — 17. 5. 1997
Weakened multicolor Ramsey numbers.
The 10th Cumberland Conference, Emory University.
202. Dortmund — 22. 5. 1997
Diagonals in convex polygons.
7th International Conference on Discrete Mathematics, Universität Dortmund.
203. London, England — 9. 7. 1997
All two-color Rado numbers for a(x + y) = bz.
Sixteenth British Combinatorial Conference.
204. Rostock — 10. 9. 1997
Weakened Ramsey numbers.
Optimal Discrete Structures and Algorithms (ODSA), Universität Rostock.
205. Atlanta, Georgia, USA — 18. 10. 1997
Minimum limited snakes.
AMS-meeting 926, Georgia Tech.
206. Wolfenbüttel — 10. 11. 1997
Mathematikgeschichte und -unterricht.
Niedersächsisches Landesinstitut für Fortbildung und Weiterbildung im
Schulwesen und Medienpädagogik (NLI).
207. Kiel — 3. 12. 1997
Polyominos — Gewinner und Verlierer.
Mathematisches Kolloquium, Universität Kiel.
18
1998
208. Boca Raton, Florida, USA — 12. 3. 1998
Cut set Catalan numbers.
29th Southeastern Conference on Combinatorics, Graph Theory, and Computing.
209. Saint Paul, Minnesota, USA — 16. 3. 1998
The kissing number of pennies.
Macalester College.
210. Saint Paul, Minnesota, USA — 16. 3. 1998
Weak Ramsey numbers.
Macalester College.
211. Louisville, Kentucky, USA — 20. 3. 1998
Crossings in drawings of complete graphs.
AMS-meeting 931, University of Louisville, Shelby Campus.
212. Rochester, New York, USA — 24. 6. 1998
Perfect number pairs.
Eighth International Conference on Fibonacci Numbers and their Applications.
213. Winston-Salem, North Carolina, USA — 9. 10. 1998
Geometrical and topological Ramsey numbers.
AMS-meeting 936, Wake-Forest University.
1999
214. Boca Raton, Florida, USA — 8. 3. 1999
Bishop and rook independence on triangle boards.
30th Southeastern Conference on Combinatorics, Graph Theory, and Computing.
215. Saint Paul, Minnesota, USA — 15. 3. 1999
Drawings of graphs.
Mathematics Colloquium, Hamline University.
216. Normal, Illinois, USA — 17. 3. 1999
Some happy end problems.
Mathematics Colloquium, Illinois State University.
217. Urbana, Illinois, USA — 20. 3. 1999
Packing problems with congruent polygons.
AMS-meeting 941, University of Illinois.
218. Ilmenau — 7. 5. 1999
Esther Klein-, Erdős-Szekeres- oder Happy-end-Probleme.
Mathematisches Kolloquium, Technische Universität Ilmenau.
219. Bled, Slovenia — 28. 6. 1999
Special numbers of crossings for complete graphs.
Fourth Slovene International Conference in Graph Theory.
19
220. Canterbury, England — 16. 7. 1999
Ramsey numbers in octahedron graphs.
Seventeenth British Combinatorial Conference.
221. Normal, Illinois, USA — 15. 10. 1999
Game board Ramsey numbers.
Thirteenth Midwestern Conference on Combinatorics, Cryptography, and
Computing.
2000
222. Praha, Czech Republic — 12. 1. 2000
Esther-Klein-Problem and variations.
Mathematical Institute, Academy of Sciences of the Czech Republic.
223. Praha, Czech Republic — 13. 1. 2000
Some variations of Ramsey numbers.
Mathematical Institute, Charles University Praha.
224. Boca Raton, Florida, USA — 16. 3. 2000
Handicap achievement for polyominoes.
31th Southeastern Conference on Combinatorics, Graph Theory, and Computing.
225. Elgersburg, Thüringen — 10. 5. 2000
Ramsey numbers for game boards.
Conference on Graph Theory.
226. Kalamazoo, Michigan, USA — 5. 6. 2000
Graceful labelings of nearly complete graphs.
Ninth quadrennial International Conference on Graph Theory, Combinatorics,
Algorithms, and Applications, Western Michigan University, Kalamazoo.
227. Minneapolis, Minnesota, USA — 14. 6. 2000
Independence on Euclidean boards.
SIAM conference on Discrete Mathematics.
228. Dortmund — 15. 7. 2000
Regular vertex-to-vertex packings.
8th International Conference on Discrete Mathematics, Universität Dortmund.
229. Luxemburg — 19. 7. 2000
Complementary Fibonacci sequences.
Ninth International conference on Fibonacci Numbers and their applications.
Institute Supérieur de Technologie, Luxemburg.
230. Stara Lesna, Slovakia — 5. 9. 2000
Edge crossing problems for graphs.
Cycles & Colorings.
231. Rostock — 11. 9. 2000
Orthogonal double covers of cubic graphs.
Optimal and discrete structures and algorithms (ODSA).
20
232. Budapest, Ungarn — 11. 10. 2000
Some Esther Klein problems.
Hajos Club, Eötvös Loránd University, Budapest, Hungary.
233. Rostock — 8. 12. 2000
Esther Klein Probleme.
Mathematisches Kolloquium, Universität Rostock.
2001
234. Budapest, Ungarn — 10. 1. 2000
Turán numbers relative to platonic solid graphs.
Finite and Infinite Combinatorics, J. Bolyai Mathematical Society and
Mathematical Institute of the Hungarian Academy of Sciences, Budapest.
235. Braunschweig — 9. 2. 2001
Ramsey-Zahlen.
Braunschweigische Wissenschaftliche Gesellschaft, Klasse Mathematik und
Naturwissenschaften.
236. Memphis, Tennessee, USA — 23. 2. 2001
Some of my Erdős problems in combinatorial geometry.
Paul Erdős Lecture Series, University of Memphis, Department of Mathematical
Sciences.
237. Baton Rouge, Louisiana, USA — 26. 2. 2001
Smallest limited edge-to-edge snakes in Euclidean tesselations.
32th Southeastern Conference on Combinatorics, Graph Theory, and Computing.
238. Calgary, Alberta, Canada — 8. 3. 2001
On smallest limited snakes.
Mathematical Colloquium, University of Calgary.
239. Regina, Saskatchewan, Canada — 13. 3. 2001
Crossings in graph drawings.
Mathematical Colloquium, University of Regina, Saskatchewan.
240. Columbia, South Carolina, USA — 16. 3. 2001
Crossings in geometric complete graphs.
AMS-meeting 963, University of South Carolina at Columbia.
241. Pretoria, South Africa — 15. 6. 2001
Some problems of Erdős-Szekeres type.
Mathematical Colloquium, University of Pretoria.
242. Ithala Game Reserve, South Africa — 19. 6. 2001.
Independence numbers for chess piece graphs.
South African International Graph Theory Conference, University of Natal.
243. Brighton, England — 3. 7. 2001
King independence on triangle boards.
Eighteenth British Combinatorial Conference.
21
244. Las Vegas, Nevada, USA — 19. 10. 2001
Handicap achievement for squares.
Fifteenth Midwestern Conference on Combinatorics, Cryptography, and
Computing.
2002
245. Rostock — 23. 1. 2002
Unabhängigkeit für Schachfigurgraphen.
Mathematisches Kolloquium, Universität Rostock.
246. Boca Raton, Florida, USA — 7. 3. 2002
Turán numbers relative to platonic solid graphs.
33rd Southeastern Conference on Combinatorics, Graph Theory, and Computing.
247. Ilmenau — 25. 3. 2002
Combinatorics on gameboards.
Kolloquium über Graphentheorie anläßlich des 75. Geburtstages von Prof. Dr.
Horst Sachs.
248. Los Angeles, California, USA — 31. 5. 2002
Achievement games for polyominoes.
Golombfest 70, University of Southern California.
249. Flagstaff, Arizona, USA — 27. 7. 2002
Positive integers (a2 + b2 )/(ab + 1) are squares.
Tenth International Conference on Fibonacci Numbers and their Applications.
250. Budapest, Hungary — 11. 7. 2002
Hyperbolic gameboards.
János Bolyai Conference on Hyperbolic Geometry.
251. Carbondale, Illinois, USA — 7. 11. 2002
King Graph Ramsey numbers.
Sixteenth Conference on Combinatorics, Cryptography, and Computing
(MCCCC), Southern Illinois University.
252. Magdeburg — 16. 11. 2002
Several modified Ramsey numbers.
Kolloquium über Kombinatorik, Otto-von-Guericke-Universität.
253. Oberwolfach — 11. 12. 2002
Ramsey numbers relative to graph sequences.
Tagung Algorithmische Graphentheorie, Mathematisches Forschungsinstitut.
2003
254. Boca Raton, Florida, USA — 4. 3. 2003
Independence on triangular hexagon boards.
34th Southeastern Conference on Combinatorics, Graph Theory, and Computing.
Florida Atlantic University.
22
255. Vancouver, British Columbia, Canada — 28. 5. 2003
Directed paths within n-gons.
The Graph Theory of Brian Alspach. Simon Fraser University.
256. Gelbensande (Rostock) — 18. 10. 2003
Ganze Zahlen (a2 + b2 )/(ab + 1) — eine IMO-Aufgabe 1988.
Festkolloquium Kombinatorik zum 65sten Geburtstag von Gustav Burosch.
257. Las Vegas, Nevada, USA — 10. 11. 2003
Ones in general binary Pascal triangles.
Seventeenth Midwest Conference on Combinatorics, Cryptography, and
Computing (MCCCC).
258. Magdeburg — 15. 11. 2003
Number of ones in general binary Pascal triangles.
Kolloquium über Kombinatorik. Otto-von-Guericke-Universität.
2004
259. Boca Raton, Florida, USA — 8. 3. 2004
Vertex Turán numbers for cube graphs.
35th Southeastern Conference on Combinatorics, Graph Theory, and Computing.
Florida Atlantic University.
260. Magdeburg — 12. 11. 2004
Turán numbers for vertices of cube graphs.
Kolloquium über Kombinatorik. Otto-von-Guericke-Universität.
2005
261. Braunschweig — 25. 2. 2005
Zum wissenschaftlichen Werk von C. F. Gauß.
Städtisches Museum Braunschweig.
262. Boca Raton, Florida, USA — 8. 3. 2005
Weak independence numbers for grid graphs.
36th Southeastern Conference on Combinatorics, Graph Theory, and Computing.
Florida Atlantic University.
263. Braunschweig — 12. 5. 2005
Mathematiker vor und nach Gauß: Gauß — Dirichlet — Dedekind.
Braunschweigisches Landesmuseum.
264. Denver, Colorado, USA — 17. 5. 2005
Crossing numbers for some circulant graphs.
Graph Theory with Altitude, Joan P. Hutchinson 60. University of Colorado at
Denver.
265. Braunschweig — 1. 6. 2005
Carl Friedrich Gauß und die Welt der Zahlen.
Braunschweigische Wissenschaftliche Gesellschaft, Diskussionsforum: Die Welt
der Zahlen, damals und heute.
23
266. Braunschweig — 18. 8. 2005
Carl Friedrich Gauß — ein Braunschweiger!
Braunschweigisches Landesmuseum.
267. Burgwedel — 8. 10. 2005
Ungelöste Fragestellungen in der Mathematik — auch im Unterricht?
Forum Mathematik 2005, Klett Verlag.
2006
268. Boca Raton, Florida, USA — 7. 3. 2006
Independent bishops on hexagon and triangle boards.
37th Southeastern Conference on Combinatorics, Graph Theory, and Computing.
269. Braunschweig — 28. 4. 2006
Unabhängige Figuren auf Euklidischen Spielbrettern.
Braunschweigische Wissenschaftliche Gesellschaft (BWG), Klasse für
Mathematik und Naturwissenschaften.
270. Rathen (Dresden) — 10. 5. 2006
Túran and rainbow numbers for hypercubes.
10th C5 Graph Theory Workshop.
271. Calgary, Alberta, Canada — 5. 6. 2006
Integral distances in geometrical figures.
CMS Summer 2006 Meeting — Symmetry in Geometry.
272. San Francisco, California, USA — 20. 7. 2006
Latin triangle and hexagon boards.
Twelfth International Conference on Fibonacci Numbers and their Applications.
273. Braunschweig — 13. 10. 2006
Richard Dedekind — 175 Jahre.
Plenum der Braunschweigischen Wissenschaftlichen Gesellschaft.
274. Braunschweig — 12. 11. 2006
Richard Dedekind — heute in Braunschweig.
Braunschweigisches Landesmuseum.
275. Magdeburg — 16. 11. 2006
Magic and latin triangle and hexagon boards.
Kolloquium über Kombinatorik. Otto-von-Guericke-Universität.
276. Bremerhaven — 20. 11. 2006
Parkettierungen.
MNU-Tagung in der Seestadt Bremerhaven.
2007
277. Boca Raton, Florida, USA — 8. 3. 2007
Latin triangle and hexagon boards.
38th Southeastern Conference on Combinatorics, Graph Theory, and Computing.
Florida Atlantic University.
24
278. Ilmenau — 30. 3. 2007
Magic and latin gameboards.
Conference on Graph Theory on the occasion of the 80th birthday of Professor
Horst Sachs. Technische Universität Ilmenau.
279. Oldenburg — 7. 2. 2007, Hannover — 12. 2. 2007, Osnabrück — 14. 2. 2007,
Hamburg — 18. 4. 2007, Bremen — 19. 4. 2007,
Kiel — 23. 4. 2007
Dreiecke in der Mathematik.
Klett Verlag — Lehrerfortbildung
280. Budapest, Ungarn — 11. 6. 2007
Vertex-to-vertex packings of congruent regular polygons.
Geometry Fest in celebration of Ted Bisztriczky’s 60th birthday. Alfred Renyi
Institute of Mathematics.
281. Bratislava, Slowakei — 2. 7. 2007
Graph drawings with straight ahead cycles.
Design Theory of Alex Rosa.
282. Magdeburg — 16. 11. 2007
Maximumum rectilinear crossing numbers for d-regular graphs.
Kolloquium über Kombinatorik. Otto-von-Guericke-Universität.
2008
283. Boca Raton, Florida, USA — 5. 3. 2008
Turán numbers for chessboard graphs.
39th Southeastern Conference on Combinatorics, Graph Theory, and Computing.
Florida Atlantic University.
284. Braunschweig — 5. 6. 2008
Kreuzungsprobleme.
Jahr der Mathematik, Braunschweigisches Landesmuseum.
285. Patras, Griechenland — 8. 7. 2008
Independent chess pieces on Fibonacci boards.
Thirteenth International Conference on Fibonacci Numbers and their
Applications.
286. Braunschweig — 30. 8. 2008
Goldener Schnitt — Fibonaccizahlen.
Sommerfest der Braunschweigischen Wissenschaftlichen Gesellschaft (BWG).
287. Braunschweig — 9. 10. 2008
Mathematische Probleme für Spielbretter.
Jahr der Mathematik, Braunschweigisches Landesmuseum.
288. Magdeburg — 14. 11. 2008
Hamiltonicity in vertex-deleted subgraphs of hypercubes.
Kolloquium über Kombinatorik, Otto-von-Guericke-Universität.
25
289. Wolfsburg — 27. 11. 2008
Ungelöste, lösbare Probleme der Elementarmathematik.
Phaeno Wolfsburg. Akademie der Wissenschaften zu Göttingen und
Braunschweigische Wissenschaftliche Gesellschaft.
2009
290. Boca Raton, Florida, USA — 4. 3. 2009
Some graph drawing problems.
40th Southeastern Conference on Combinatorics, Graph Theory, and Computing.
Florida Atlantic University.
291. Elgersburg, Thüringen — 27. 3. 2009
Some cube graph problems.
Third International Conference on Combinatorics, Graph Theory, and
Applications.
292. Rathen (Dresden) — 6. 5. 2009
Rainbow colorings of cube graphs.
13th C5 Graph Theory Workshop.
293. Braunschweig — 19. 10. 2009
Sangaku — Japanische Tempelgeometrie.
Deutsch-Japanische Gesellschaft, Haus der Wissenschaft.
294. Magdeburg — 13. 11. 2009
Maximum rectilinear crossing number of the Petersen graph.
Kolloquium über Kombinatorik, Otto-von-Guericke-Universität.
2010
295. Boca Raton, Florida, USA — 10. 3. 2010
Crossing numbers for some distance graphs.
41st Southeastern Conference on Combinatorics, Graph Theory, and Computing.
Florida Atlantic University.
296. Rathen (Dresden) — 5. 5. 2010
Saturated rainbow edge colorings of cube graphs.
14th C5 Graph Theory Workshop.
297. Rostock — 19. 5. 2010
Extremalprobleme für Würfelgraphen.
Mathematisches Kolloquium, Universität Rostock.
298. Morelia, Mexiko — 5. 7. 2010
Crossing numbers for Fibonacci distance graphs.
14th International Conference on Fibonacci Numbers and their Applications.
Mathematical Institute UNAM.
299. Saarbrücken — 13. 11. 2010
A conjecture on Pascal’s triangle.
Colloquium on Combinatorics, Max Planck Institut Informatik.
26
2011
300. Boca Raton, Florida, USA — 10. 3. 2011
Saturated vertex Turán numbers for cube graphs.
42nd Southeastern Conference on Combinatorics, Graph Theory, and
Computing. Florida Atlantic University.
301. Elgersburg, Thüringen — 24. 3. 2011
Cube graphs with saturated edge rainbow colorings.
Fourth International Conference on Combinatorics, Graph Theory, and
Applications.
302. Rathen (Dresden) — 3. 5. 2011
Remarks on a conjecture of S. Jendrol on the 5-cube.
15th C5 Graph Theory Workshop.
303. Ilmenau — 30. 6. 2011
Von der Jagd auf Ramsey-Zahlen.
Mathematisches Kolloquium, Technische Universität Ilmenau.
304. Magdeburg — 11. 11. 2011
Polychromatic vertex colorings of cube graphs.
Kolloquium über Kombinatorik, Otto-von-Guericke-Universität.
2012
305. Boca Raton, Florida, USA — 7. 3. 2012
Saturated rainbow edge colorings of cube graphs.
43rd Southeastern Conference on Combinatorics, Graph Theory, and Computing.
Florida Atlantic University.
306. Elgersburg, Thüringen — 26. 3. 2012
Some crossing problems.
Workshop “Graph Theory”.
307. Wolfsburg — 19. 4. 2012
Kugel und Kugelpackungen: Alte und neue Fragen an die Mathematik.
Phaeno Wolfsburg. Akademie der Wissenschaften zu Göttingen und
Braunschweigische Wissenschaftliche Gesellschaft.
308. Rathen (Dresden) — 8. 5. 2012
Turán type numbers for edges in hypercube graphs.
16th C5 Graph Theory Workshop.
309. Rathen (Dresden) — 8. 5. 2012
Minimum number of crossings of pseudo diagonals in convex n-gons.
16th C5 Graph Theory Workshop.
310. Eger, Ungarn — 26. 6. 2012
On h-perfect numbers.
15th International Conference on Fibonacci Numbers and Their Applications.
Eszterházy Károly College.
27
311. Berlin — 16. 11. 2012
Extremal maximum rectilinear crossing numbers of 2-regular graphs.
Kolloquium über Kombinatorik, Technische Universität.
2013
312. Boca Raton, Florida, USA — 8. 3. 2013
On the minimum of the maximum rectilinear crossing numbers of
regular graphs.
44th Southeastern Conference on Combinatorics, Graph Theory, and Computing.
Florida Atlantic University.
313. Wolfsburg — 24. 10. 2013
Was sagen uns mathematische Figuren?
Phaeno, Wolfsburg. Akademie der Wissenschaften zu Göttingen und
Braunschweigische Gesellschaft
314. Ilmenau — 9. 11. 2013
Maximum rectilinear crossing number in drawings of the complete
graph with a given convex hull.
Kolloquium über Kombinatorik, Technische Universität.
2014
315. Rochester, New York, USA — 24. 7. 2014
Generalized Pascal Steinhaus triangles.
16th International Conference on Fibonacci Numbers and their Applications,
Rochester Institute of Technologie (RIT).
316. Ilmenau — 7. 11. 2014
Steinhaus triangles with generalized Pascal addition.
Kolloquium über Kombinatorik, Technische Universität.
2015
317. Boca Raton, Florida, USA — 4. 3. 2015
Anti-Turán numbers for cube graphs.
46th Southeastern Conference on Combinatorics, Graph Theory, and Computing.
Florida Atlantic University.
318. Boca Raton, Florida, USA — 5. 3. 2015
Problems connected with Pascal’s triangle.
46th Southeastern Conference on Combinatorics, Graph Theory, and Computing.
Florida Atlantic University.
319. Washington, DC, USA — 8. 3. 2015
Crossings problems for complete graphs.
1107th AMS meeting. Georgetown University.
320. Rathen — 5. 5. 2015
Drawings of the Petersen graph.
19th C5 Graph Theory Workshop.
28
321. Rathen — 5. 5. 2015
The drawing Ramsey number Dr(K ).
19th C5 Graph Theory Workshop.
322. Ilmenau — 7. 11. 2015
The maximum crossing number of the Petersen graph.
Kolloquium über Kombinatorik, Technische Universität.
29