English

Two cohomology theories for structured spaces

Algebraic Topology 2020-04-27 v2 K-Theory and Homology

Abstract

In [1] we defined a new kind of space called 'structured space' which locally resembles, near each of its points, some algebraic structure. We noted in the conclusion of the cited paper that the maps fsf_s and hh, which are of great importance in the theory of structured spaces, have some connections with the notions of presheaves (and hence also sheaves) and vector bundles. There are well known cohomology theories involving such objects; this suggests the possibility of the existence of (co)homology theories for structured spaces which are somehow related to fsf_s and hh. In this paper we indeed develop two cohomology theories for structured spaces: one of them arises from fsf_s, while the other one arises from hh. In order to do this, we first develop a more general cohomology theory (called rectangular cohomology in the finite case, and square cohomology in the infinite case), which can actually be applied also in many other situations, and then we obtain the cohomology theories for structured spaces as simple consequences of this theory.

Keywords

Cite

@article{arxiv.2004.11152,
  title  = {Two cohomology theories for structured spaces},
  author = {Manuel Norman},
  journal= {arXiv preprint arXiv:2004.11152},
  year   = {2020}
}

Comments

26 pages; Sections 2 and 3 have been improved; a discussion on Eilenberg-Steenrod axioms has been added

R2 v1 2026-06-23T15:03:08.150Z