Volume IV

VOL 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. Cooke, Richard Duran, Ann 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

Errata

    

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

   64
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 Erdös, Alexander Soifer 110
The Angle-side Reciprocity of Quadrangles by Branko Grünbaum 115
Unit-Distance Preserving Theorem is Logically Non-Trivial by Olga Kosheleva, Vladik Kreinovich… 119

Solutions of Previsoudly Published Problems

    
Venn Diagrams: Announcement of some new results by Kiran B Chilakamarri, Peter Hamburger, Raymond E Pippert 129
Recent Books   138