Volume XX


Geombinatorics Quarterly

July 2010 (Volume XX, Issue 1)

Editors Page   4
New Essays    
Geometric Proof of a Ramsey-Type Result for Disjoint Empty Convex Polygons II…5 By Bhaswar B. Bhattacharya and Sandip Das 5
Diagonalization is also Practically Useful: A Geometric Idea By Martine Ceberio and Vladik Kreinovich 15
Automated Proofs in Geometry: Computing Upper Bounds for the Helibronn Problems for Triangles By Francesso De Comité,  Jean-Paul Delahaye 21
A note on a Ramsey-type problem on the integers By Balázs Gosztonyi 27
Book Reviews    
Escape of the Mathematical Kind, A Review by Alexander Soifer of Reinhard Siegmund-Schultze’s monograph   31
Mathematicians Fleeing from Nazi Germany:
Individual Fates and Global Impact
Recent Books   38
Subscription Forms   39

October 2010 (Volume XX, Issue 2)

Editors Page   44
New Essays    
Grünbaum’s convex quadrangles enumeration and an Extension of the angle-side reciprocity of quadrangles By Orlando B. Alonso 45
Dirac’s conjecture concerning high-incidence elements in aggregates By Branko Grünbaum 48
Clifford Algebras and Graphs By Tanya Khovanova 56
 Books Reviews   77
A Raw Graph Theory Text, A Review by Alexander Soifer of Xiong Bin and Zheng Zhongyi’s textbook Graph Theory (“Mathematical Olympiad” Ser., Vol. 3)   77
Passing the Flaming Torch! A Review by Alexander Soifer of Isaak M. Yaglom’s book “Geometric Transformations IV”   80
Recent Books   85
Subscription Form   87

January 2011 (Volume XX, Issue 3)

Editors Page   92
New Essays    
Frobenius Problems in the Gaussian Integers By Ken DutchPeter JohnsonChristopher Maier, and Jordan Januszewski 110
Another Improvement of the Lower Bound in Larcher-Pillichchammer Inequality By Pavel Novotný 115
Book Reviews   24

Which Comes First: Research or it Conclusions?A Review by Alexander Soifer of Rüdiger Thiele’s book “Van der Waerden in

Sensationalist Journalism vs. Exposition of Mathematics
A Review by Alexander Soifer of George G, Szpiro’s book
“A Mathematical Medly: Fifty Easy Pieces of Mathematics”
To Save and Harass, a review by Alexander Soifer of Alexander Stephan’s book “Communazis’: FBI Surveillance of German Émigré Writers”   128
Recent Books   133
Subscription Form   135

April 2011 (Volume XX, Issue 4)

Editors Page   140
New Essays    
Simple Wedge Points By Shimon Garti 141
Rectilinear Equidistant Sets in Rd By Jeong-Hyun Kang 151
A Finite Difference Approach to Counting Quadrangles in a Circle By Gregory P. Tollisen and Tamás Lengyel 168
Letters to the Editor   180
Recent Books   181
Subscription Form   183