# Bridges 2011 Regular Paper

Good Stamps for Wallpaper Patterns

Manuel Arala Chaves

(Proceedings pages 403–410)

## Abstract

The problem of identifying how many (doubly periodic) patterns exist
on the plane, which are different from the point of view of symmetry
can be approached in different ways and using different mathematical
tools. And the final conclusion that there are only a finite number
is by no means evident a priori. Using the DVD Symmetry---the
dynamical way extensively we will look at examples of stamps with
different shapes and properties, which produce figures with different
types of symmetry.

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