Volume IV


Geombinatorics Quarterly

July 1994 (Volume IV, Issue 1)

Editors Page   3

New Essays

Coloring R with the respect to Different Metrics by Izak Broere 4
Sets of Points in the Plane with Few Isosceles Triangles by  Paul Erdös 10
Quadrangles, Pentagons, and Computers, Revisited by Branko Grünbaum 11
How to Represent Measurement Errors? by Vladik Kreinovich 17
A Triangle-Free 4-chramatic Graph in the Plane by Paul O’Donnell 23

Letters to the Editor

Robert Hochberg and Paul O’Donnell 30

October 1994 (Volume IV, Issue 2)

Editors Page    

New Essays

Geombinatoric Problems of Environmentally Safe Manufacturing and Linear Logic by Daniel E. CookeRichard DuranAnn Gates, and Vladik Kreinovich 35
Equidistant Points in the Plane by Branko Grünbaum 36
Good Packings in Bad Coverings by Paul Erdös 49
Uniform Tilings of 3-Space by Branko Grünbaum 49



Corrections for Sets of Points in the Plane with Few Isosceles Triangles

by Paul Erdös 57
Recent Books   58

January 1995 (Volume IV, Issue 3)

Editors Page   63
New Essays    

A 4-Chromatic Unit DIstance Graph With No Triangles

The Parabolic 3-Space by Paul Erdös 77
Which Algorithms are Feasible and Which are not Depends on the Geometry of Space-Time by Alexander Soifer 80
Recent Books   98

April 1995 (Volume IV, Issue 4)

Editors Page   103
New Essays    

Some Problems Arising from Unit-Distance Graphs with no Triangles

by Kiran B. Chilakarmarri 104
Squares in a Square by Paul ErdösAlexander Soifer 110
The Angle-side Reciprocity of Quadrangles by Branko Grünbaum 115
Unit-Distance Preserving Theorem is Logically Non-Trivial by Olga KoshelevaVladik Kreinovich… 119

Solutions of Previsoudly Published Problems

Venn Diagrams: Announcement of some new results by Kirran B ChilakamarriPeter HamburgerRaymond E Pippert 129
Recent Books   138