Vol XXX 2020 – 2021

Geombinatorics

A quarterly journal on open problems of combinatorial and discrete geometry and related areas.

July 2020 – April 2021

Issue 1   Issue 2   Issue 3    Issue 4 


Issue 1 (July 2020)


CONTENTS XXIX (1)

Editor’s Page………………….………………………………..….4

New Essays

A small 6-chromatic unit-distance graph in R3……………………………..5

by Aubrey de Grey

Polyiamonds Attaining Extremal Topological
Properties, Part I…………………………………………………………….……….…14

by Greg Malen and Érika Roldán

What percent of the plane can be properly 5- and
6-colored?……….…………………………………………………………………………25

by Jaan Parts

Moral Principles for My Young Colleagues, or
A Tale of Big Man and Little Bird………………………………….……….……40

by Alexander Soifer   

New Subscription Form…………….……….………………………47


Issue 2  (October 2020)


Editor’s Page………………….…………………………………

New Essays

       Recent Books…………………………………………….…

Subscription Form…………….……….………………………


Issue 3 (January 2021)


Editor’s Page………………….…………………………………

New Essays

       Recent Books…………………………………………….…

Subscription Form…………….……….………………………


Issue 4 (April 2021)

CONTENTS XXIX (4)

Editor’s Page………………….………………………………..….

New Essays

       Recent Books…………………………………………….…

Subscription Form…………….……….………………………