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Étale groupoid algebras with coefficients in a sheaf and skew inverse semigroup rings

Part of: Topological and differentiable algebraic systems Semigroups Special categories Rings and algebras arising under various constructions

Published online by Cambridge University Press:  07 August 2020

Daniel Gonçalves  and
Benjamin Steinberg
Daniel Gonçalves*
Affiliation:
Departmento de Matemática, Universidade Federal de Santa Catarina, Florianópolis, Brazil
Benjamin Steinberg
Affiliation:
Department of Mathematics, City College of New York, New York, NY, USA e-mail: [email protected]
*
e-mail: [email protected]
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Abstract

Given an action ${\varphi }$ of inverse semigroup S on a ring A (with domain of ${\varphi }(s)$ denoted by $D_{s^*}$ ), we show that if the ideals $D_e$ , with e an idempotent, are unital, then the skew inverse semigroup ring $A\rtimes S$ can be realized as the convolution algebra of an ample groupoid with coefficients in a sheaf of (unital) rings. Conversely, we show that the convolution algebra of an ample groupoid with coefficients in a sheaf of rings is isomorphic to a skew inverse semigroup ring of this sort. We recover known results in the literature for Steinberg algebras over a field as special cases.

Keywords

Étale groupoidsinverse semigroupsrings

MSC classification

Primary: 22A22: Topological groupoids (including differentiable and Lie groupoids)
Secondary: 20M18: Inverse semigroups 18B40: Groupoids, semigroupoids, semigroups, groups (viewed as categories) 16S36: Ordinary and skew polynomial rings and semigroup rings
Type
Article
Information
Canadian Journal of Mathematics , Volume 73 , Issue 6 , December 2021 , pp. 1592 - 1626
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Copyright
© Canadian Mathematical Society 2020

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Footnotes

B. S. thanks the Fulbright commission for its support in visiting the Federal University of Santa Catarina in Brazil and the PSC-CUNY. D. G. was partially supported by Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) grant numbers 304487/2017-1 and 406122/2018-0 and Capes-PrInt grant number 88881.310538/2018-01—Brazil.

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