English

The local-global property for G-invariant terms

Rings and Algebras 2021-10-22 v2 Computational Complexity

Abstract

For some Maltsev conditions Σ\Sigma it is enough to check if a finite algebra A\mathbf A satisfies Σ\Sigma locally on subsets of bounded size, in order to decide, whether A\mathbf A satisfies Σ\Sigma (globally). This local-global property is the main known source of tractability results for deciding Maltsev conditions. In this paper we investigate the local-global property for the existence of a GG-term, i.e. an nn-ary term that is invariant under permuting its variables according to a permutation group GG \leq Sym(nn). Our results imply in particular that all cyclic loop conditions (in the sense of Bodirsky, Starke, and Vucaj) have the local-global property (and thus can be decided in polynomial time), while symmetric terms of arity n>2n>2 fail to have it.

Keywords

Cite

@article{arxiv.2109.02065,
  title  = {The local-global property for G-invariant terms},
  author = {Alexandr Kazda and Michael Kompatscher},
  journal= {arXiv preprint arXiv:2109.02065},
  year   = {2021}
}

Comments

22 pages

R2 v1 2026-06-24T05:41:37.145Z