Volume XXV


Geombinatorics Quarterly

July 2015 (Volume XXV, Issue 1)

Editors Letter   4
The Zipper Foldings of the Diamond… By Erin Wolf ChambersDi FangKyle Sykes,
Cynthia Traub, and Philip Trettenero
A Simple Geometric Model Provides a
Possible Quantitative Explanation of the
Advantages of Immediate Feedback in
Student Learning
By Octavio LermaOlga Kosheleva, and
Vladik Kreinovich
Coloring Regions on a Sphere to Forbid the
Unit Distance
By Christopher Maier 30
Weighted Erdös-Mordell Inequality for
Star-shaped Polygons
By Moshe Rosenfeld and Tran Nhat Tan 36
A Book is Born: “Topics in Chromatic Graph Theory”
By Robin J. Wilson and Lowell W. Beineke (ed’s
By Alexander Soifer 45

October 2015 (Volume XXV, Issue 2)

Editor’s Page   52
New Essays    
Fair Magic Hexagon and Triangle Boards By Jens-P. BodeHeiko Harborth, and Stefan Krause 53
Are All Convex Polyhedra Tetragonalizable? By Branko Grünbaum 56
A Very Short Proof of a Well-known Fact About
Circles in the Plane
By Peter Johnson and Matt Noble 65
A Feasible Algorithm for Checking n-Scissors
Congruence of Polyhedra in Rd
By Olga Kosheleva and Vladik Kreinovich 70
Truth, like water, will find its way out:
My Response to Günter M. Ziegler and
the Deutsche Mathematiker-Vereinigung
By Alexander Soifer 76

January 2016 (Volume XXV, Issue 3)

Editor’s Page   92
New Essays    
On a 3-Uniform Hypergraph Coloring
Problem in the Integers
By Loren Anderson and Peter D. Johnson Jr. 93
On Visible Tilings By J.R. BurtWilliam Staton and Benton Tyler 103
Coloring the Real Line with Monochromatic Intervals By Doyon Kim 113
Why Injecting Fine Dust into a Tornado is more
Promising than Injecting Coarse Dust: A Geometric Explanation
By Octavio Lerma, Olga Kosheleva and
Vladik Kreinovich
Should We Accept the German Proposal of Their Monopoly
on the Third Reich History?
A Response to Reinhard Siegmund-Schultze
By Alexander Soifer 123

April 2016 (Volume XXV, Issue 4)

Editors Letter   140
New Essays    
On Geometry of Finsler Causality:
For Convex Cones, there Is No
Affine-Invariant Linear Order
(Similar to Comparing Volumes)…
By Olga Kosheleva and Vladik Kreinovich 142
A Generalized Isodiametric Problem By Christos Pelekis 151
Coloring Blocks of Consecutive Integers
to Forbid Three Distances
By John Ryan 168
Recent Books   133