Pattern-equivariant homology

Research output: Working paper

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DatePublished - 21 Sep 2016
Number of pages41
Original languageEnglish

Abstract

Pattern equivariant (PE) cohomology is a well established tool with which to interpret the Cech cohomology groups of a tiling space in a highly geometric way. We consider here homology groups of locally finite but non-compactly supported PE chains. For FLC tilings with respect to translations, we show that these groups are Poincare dual to the PE cohomology groups. For tilings with FLC with respect to rigid motions, the PE chains exhibit a singular behaviour at points of rotational symmetry which often adds extra torsion to the calculated invariants. We present an efficient method for computation of these groups for hierarchical tilings.

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