Batanin's category of pruned trees is Koszul

Details Batanin's category of pruned trees is Koszul Batanin's category of pruned trees is Koszul

2009-09-29

arxiv.org/abs/0909.5447v2

Mathematics

K-Theory and Homology

44 pages. In French. English summary. Modifications in v2: part subdivision added to make the article plan more evident, some

Scientific paper

The category of pruned trees has been defined by M. Batanin with the aim of understanding the cell structure of certain E_n-operads in categorical terms. The objects of this category are planar trees with n levels so that all leaves are at the top level of the tree. The goal of this article is to prove that the category of pruned trees is Koszul. This result gives us a minimal differential graded model of this category, small complexes to compute Tor and Ext functors in associated categories of diagrams, and allows us to generalize a recent result of M. Livernet and B. Richter about the interpretation of E_n-homology in terms of categorical Tor functors.

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