Geombinatorics
A quarterly journal on open problems of combinatorial and discrete geometry and related areas.
July 2015 – April 2016
Issue 1, Issue 2, Issue 3, Issue 4
Table of Contents
July 2015 (Volume XXV, Issue 1)
Editors Page……………………………………………………………………………………………4
New Essays
- The Zipper Foldings of the Diamond…………………………………………………5
By Erin Wolf Chambers, Di Fang, Kyle Sykes,
Cynthia Traub, and Philip Trettenero
- A Simple Geometric Model Provides a
Possible Quantitative Explanation of the
Advantages of Immediate Feedback in
Student Learning……………………………………………………………………………….22
By Octavio Lerma, Olga Kosheleva, and
Vladik Kreinovich
- Coloring Regions on a Sphere to Forbid the
Unit Distance…………………………………………………………………………..………..30
By Christopher Maier
- Weighted Erdös-Mordell Inequality for
Star-shaped Polygons……………………………………………………………………..….36
By Moshe Rosenfeld and Tran Nhat Tan
Reviews
- A Book is Born: “Topics in Chromatic Graph Theory”
By Robin J. Wilson and Lowell W. Beineke (ed’s)………………………………..….45
By Alexander Soifer
Subscription Form……………………………………………………………………………..47
Table of Contents
October 2015 (Volume XXV, Issue 2)
Editor’s Page………………….…………………….………………..…………..52
New Essays
- Fair Magic Hexagon and Triangle Boards……………………….53
by Jens-P. Bode, Heiko Harborth, and Stefan Krause
- Are All Convex Polyhedra Tetragonalizable? …………………..56
by Branko Grünbaum
- A Very Short Proof of a Well-known Fact About
Circles in the Plane…………………………………………………….65
by Peter Johnson and Matt Noble
- A Feasible Algorithm for Checking n-Scissors
Congruence of Polyhedra in Rd……………….…….……………..70
by Olga Kosheleva and Vladik Kreinovich
- Truth, like water, will find its way out:
My Response to Günter M. Ziegler and
the Deutsche Mathematiker-Vereinigung …….…………………76
by Alexander Soifer
Subscription Form…………….……….……….…..……………..87
Table of Contents
January 2016 (Volume XXV, Issue 3)
Editor’s Page………………….…………………….……………92
New Essays
On a 3-Uniform Hypergraph Coloring
Problem in the Integers……………………………………….….93
by Loren Anderson and Peter D. Johnson Jr.
On Visible Tilings………………………………………………………………103
by J.R. Burt, William Staton and Benton Tyler
Coloring the Real Line with Monochromatic Intervals………………………..………………………………….113
by Doyon Kim
Why Injecting Fine Dust into a Tornado is more
Promising than Injecting Coarse Dust:
A Geometric Explanation……………….………….…………….118
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……………..……123
by Alexander Soifer
Recent Books 133