Higher limits of wider systems
Logic
2025-07-09 v1 K-Theory and Homology
Abstract
Write for what might be described as the most elementary nontrivial inverse system of abelian groups indexed by the functions from the cardinal to the set of natural numbers. The question of whether for any fixed the derived limit may vanish for only a nonempty subset of the class of infinite cardinals is recorded in both [Be17] and [Ban23], and bears closely on several related further ones. We answer this question in the affirmative; in fact, we show the maximal possibility, namely that this can simultaneously happen in every degree .
Keywords
Cite
@article{arxiv.2507.05471,
title = {Higher limits of wider systems},
author = {Jeffrey Bergfalk and Matteo Casarosa},
journal= {arXiv preprint arXiv:2507.05471},
year = {2025}
}
Comments
25 pages; comments welcome