Volume XIX

VOL XIX

Geombinatorics Quarterly

July 2009 (Volume XIX, Issue 1)

Editors Page   4
New Essays    
36 Two-Colored Points with no Empty Monochromatic Convex FourgonsPoint-Sets in General Position with Many Similar Copies of a Pattern: Without a Number of Colinear Points or in Parallelograph-Free Position  By Clemens Huemer and Carlos Seara 5
Geometry of a Cockroach Paths: A Possible Explanation By Olga Kosheleva 7
On Chromatic Numbers of Space-Times: Open Problems By Olga Kosheleva and Vladik Kreinovich 14
Tiling a Deficient Rectangle by P-Pentominoes By Catalin Nitica and Viorel Nitika 18
Triangle-free minimum distance graphs in the plane By Konrad J. Swanepoel 28
Subscription Form   31

October 2009 (Volume XIX, Issue 2)

Editors Page   36
Part I: Branko Grünbaum, Mathematician & Man    
The Great Geometer is 80 By Alexander Soifer 37
On Branko Grünbaum’s 80th Birthday By Mathew Kahle 42
Branko, teacher, mentor, and a great friend By Moshe Rosenfeld 46
Branko Grünbaum is Eighty By Joseph Zaks 49
Part II: Mathematical Essays    
Uniform Columns By Branko Grünbaum 52
A Sausage Conjecture for Edge-to-Edge Regular Pentagons By Jens-P. Bode and Heiko Harborth 60
The Odd-Distance Plane Graph By Moshe Rosenfeld 62
A Note on Blocking Visibility Between Points By Adrian DumitrescuJános Pach, and Géza Tóth 67
Recent Books   74
Subscription Form   75

January 2010 (Volume XIX, Issue 3)

Editors Page   80
New Essays    
Point-Sets in General Position with Many Similar Copies of a Pattern By Branko GrünbaumM. Abrego and Silvia Fernandez-Merchant 81
Tiling’s by Some Nonconvex Parallelhedra By Branko Grünbaum 100
Early Start can Inhibit Learning: A Geombetric Explanation By Olga Koshelva 108
Monochromatic Triangles in E2 By Eric Tressler 119
Recent Books   126
Subscription Form   127

April 2010 (Volume XIX, Issue 4)

Editors Page   132
New Essays    
Point-Sets in General Position with Many Similar Copies of a Pattern: Without a Number of Colinear Points or in Parallelograph-Free Position By Bernardo B. Ábrego and Silvia Fernández-Merchant 133
Geometric Proof of a Ramsey-Type Result for Disjoint Empty Convex Polygons IDiagonalization is also Practically Useful: A Geometric Idea By Bhaswar B. Bhatacharya and Sandip Das 146
3-Regular Mathstick Kurz and Giuseppe Mazzuoccolo   156
Recent Books   126
Subscription Form   175