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arXiv:2006.15745 [math.GR]AbstractReferencesReviewsResources

On lattice of congruences on graph inverse semigroups

Yongle Luo, Zhengpan Wang

Published 2020-06-28Version 1

Congruences on a graph inverse semigroup were recently described in terms of the underline graph. Based on such descriptions, we show that the lattice of congruences on a graph inverse semigroup is upper semimodular but not lower semimodular.

Comments: 15 pages
Categories: math.GR
Subjects: 20M18
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