English

Intersection Homology. General perversities and topological invariance

Algebraic Topology 2019-11-13 v3

Abstract

Topological invariance of the intersection homology of a pseudomanifold without codimension one strata, proven by Goresky and MacPherson, is one of the main features of this homology. This property is true for codimension-dependent perversities with some growth conditions, verifying p(1)=p(2)=0\overline p(1)=\overline p(2)=0. King reproves this invariance by associating an intrinsic pseudomanifold XX^* to any pseudomanifold XX. His proof consists of an isomorphism between the associated intersection homologies Hp(X)Hp(X)H^{\overline{p}}_{*}(X) \cong H^{\overline{p}}_{*}( X^*) for any perversity p\overline{p} with the same growth conditions verifying p(1)0\overline p(1)\geq 0. In this work, we prove a certain topological invariance within the framework of strata-dependent perversities, p\overline{p}, which corresponds to the classical topological invariance if p\overline{p} is a GM-perversity. We also extend it to the tame intersection homology, a variation of the intersection homology, particularly suited for ``large'' perversities, if there is no singular strata on XX becoming regular in XX^*. In particular, under the above conditions, the intersection homology and the tame intersection homology are invariant under a refinement of the stratification.

Keywords

Cite

@article{arxiv.1602.03009,
  title  = {Intersection Homology. General perversities and topological invariance},
  author = {David Chataur and Martintxo Saralegi-Aranguren and Daniel Tanré},
  journal= {arXiv preprint arXiv:1602.03009},
  year   = {2019}
}
R2 v1 2026-06-22T12:46:41.100Z