English

Expanding \v{C}ech cohomology for quantales

Category Theory 2024-09-17 v2 Rings and Algebras

Abstract

We expand \v{C}ech cohomology of a topological space XX with values in a presheaf on XX to \v{C}ech cohomology of a commutative ring with unity RR with values in a presheaf on RR. The strategy is to observe that both the set of open subsets of XX and the set of ideals of RR provide examples of a (semicartesian) quantale. We study a particular pair of (adjoint) functors (θ,τ)(\theta, \tau) between the quantale of open subsets of XX and the quantale of ideals of C(X)C(X), the ring of real-valued continuous functions on XX. This leads to the main result of this paper: the qqth \v{C}ech cohomology groups of XX with values on the constant sheaf FF on XX is isomorphic to the qqth \v{C}ech cohomology groups of the ring C(X)C(X) with values on a sheaf FτF \circ \tau on C(X)C(X).

Keywords

Cite

@article{arxiv.2404.12884,
  title  = {Expanding \v{C}ech cohomology for quantales},
  author = {Ana Luiza Tenório and Peter Arndt and Hugo Luiz Mariano},
  journal= {arXiv preprint arXiv:2404.12884},
  year   = {2024}
}

Comments

20 pages. We have removed one of the examples and the notion of a "basis" for a quantale; we will discuss them elsewhere with more details

R2 v1 2026-06-28T15:59:50.137Z