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arxiv: 1311.4599 · v1 · pith:XDQJFR4Xnew · submitted 2013-11-19 · 🧮 math.AC · math.CO

Cellular resolutions from mapping cones

classification 🧮 math.AC math.CO
keywords resolutionscellularcomplexesmappingresolutioncasecomplexcone
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One can iteratively obtain a free resolution of any monomial ideal $I$ by considering the mapping cone of the map of complexes associated to adding one generator at a time. Herzog and Takayama have shown that this procedure yields a minimal resolution if $I$ has linear quotients, in which case the mapping cone in each step cones a Koszul complex onto the previously constructed resolution. Here we consider cellular realizations of these resolutions. Extending a construction of Mermin we describe a regular CW-complex that supports the resolutions of Herzog and Takayama in the case that $I$ has a `regular decomposition function'. By varying the choice of chain map we recover other known cellular resolutions, including the `box of complexes' resolutions of Corso, Nagel, and Reiner and the related `homomorphism complex' resolutions of Dochtermann and Engstr\"om. Other choices yield combinatorially distinct complexes with interesting structure, and suggests a notion of a `space of cellular resolutions'.

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