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A note on gamma triangles and local gamma vectors

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arxiv 1809.00575 v1 pith:URW5VEUW submitted 2018-09-03 math.CO

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keywords gammalocalclustercomplexesgamma-trianglestrianglesarticleathanasiadis
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This article introduces Gamma-triangles, which are closely related to and more fundamental than F-triangles and H-triangles that have been used in the combinatorics of cluster complexes. It is proved that Gamma-triangles can be expressed as sums of the local gamma-vectors introduced by Athanasiadis, which themselves refine the local h-vectors attached by Stanley to simplicial subdivisions. Gamma triangles of all cluster complexes are then explicitly computed.

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