Filtering germs: Groupoids associated to inverse semigroups

Becky Armstrong*, Lisa Orloff Clark, Astrid an Huef, Malcolm Jones, Ying-Fen Lin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


We investigate various groupoids associated to an arbitrary inverse semigroup with zero. We show that the groupoid of filters with respect to the natural partial order is isomorphic to the groupoid of germs arising from the standard action of the inverse semigroup on the space of idempotent filters. We also investigate the restriction of this isomorphism to the groupoid of tight filters and to the groupoid of ultrafilters.
Original languageEnglish
JournalExpositiones Mathematicae
Early online date15 Jul 2021
Publication statusEarly online date - 15 Jul 2021


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