Triangles, squares and geodesics

Details Triangles, squares and geodesics Triangles, squares and geodesics

2009-10-29

arxiv.org/abs/0910.5688v1

Mathematics

Group Theory

34 pages, 12 figures

Scientific paper

In the early 1990s Steve Gersten and Hamish Short proved that compact nonpositively curved triangle complexes have biautomatic fundamental groups and that compact nonpositively curved square complexes have biautomatic fundamental groups. In this article we report on the extent to which results such as these extend to nonpositively curved complexes built out a mixture of triangles and squares. Since both results by Gersten and Short have been generalized to higher dimensions, this can be viewed as a first step towards unifying Januszkiewicz and {\'S}wi{\.a}tkowski's theory of simplicial nonpositive curvature with the theory of nonpositively curved cube complexes.

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