English

Cellular resolutions from mapping cones

Commutative Algebra 2015-10-12 v1 Combinatorics

Abstract

One can iteratively obtain a free resolution of any monomial ideal II 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 II 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 II 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'.

Keywords

Cite

@article{arxiv.1311.4599,
  title  = {Cellular resolutions from mapping cones},
  author = {Anton Dochtermann and Fatemeh Mohammadi},
  journal= {arXiv preprint arXiv:1311.4599},
  year   = {2015}
}

Comments

21 pages, 4 figures

R2 v1 2026-06-22T02:10:05.897Z