English

The pairwise distributive law of semilattice congruences

Rings and Algebras 2025-11-04 v1 Commutative Algebra

Abstract

We show that the congruence lattice of a semilattice satsifies a form of distributivity relative to principal congruences of the form Θts,s \Theta_{t \odot s, s}. Particularly, we establish that semilattice congruences obey the ``pairwise distributive law": (iwΩi)Θts,s=k,rw((ΩkΩr)Θts,s) (\cap_{i \in w} \Omega_{i}) \vee \Theta_{t \odot s, s} = \cap_{k,r \in w} \big( (\Omega_{k} \cap \Omega_{r}) \vee \Theta_{t \odot s, s} \big) for any family of congruences {Ωi:iw}\{ \Omega_{i} : i\in w \}, with ww a possibly infinite set.

Keywords

Cite

@article{arxiv.2511.00892,
  title  = {The pairwise distributive law of semilattice congruences},
  author = {Fernando Martin-Maroto and Antonio Ricciardo and Gonzalo G. de Polavieja},
  journal= {arXiv preprint arXiv:2511.00892},
  year   = {2025}
}