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

Published online by Cambridge University Press:  07 August 2020

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: bsteinberg@ccny.cuny.edu
*

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.

Type
Article
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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