English

Relative group (co)homology theories with coefficients and the comparison homomorphism

K-Theory and Homology 2020-05-14 v2 Algebraic Topology

Abstract

Let GG be a group, let HH be a subgroup of GG and let \Or(G)\Or(G) be the orbit category. In this paper we extend the definition of the relative group (co)homology theories of the pair (G,H)(G,H) defined by Adamson and Takasu to have coefficients in an \Or(G)\Or(G)-module. There is a canonical comparison homomorphism defined by Cisneros-Molina and Arciniega-Nev\'arez from Takasu's theory to Adamson's one. We give a necessary and sufficient condition on the subgroup HH for which the comparison homomorphism is an isomorphism for all coefficients. We also use the L\"uck-Wiermann construction to introduce a long exact sequence for Adamson (co)homology. Finally, we provide some examples of explicit computations for the comparison homomorphism.

Keywords

Cite

@article{arxiv.1809.01209,
  title  = {Relative group (co)homology theories with coefficients and the comparison homomorphism},
  author = {José Antonio Arciniega-Nevárez and José Luis Cisneros-Molina and Luis Jorge Sánchez Saldaña},
  journal= {arXiv preprint arXiv:1809.01209},
  year   = {2020}
}

Comments

Shortened version. This version was accepted for publication in Quaestiones Mathematicae