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Let $K$ be a commutative ring with unit and $S$ an inverse semigroup. We show that the semigroup algebra $KS$ can be described as a convolution algebra of functions on the universal \'etale groupoid associated to $S$ by Paterson. This…

Rings and Algebras · Mathematics 2009-03-23 Benjamin Steinberg

We classify conjugacy classes of involutions in the isometry groups of nondegenerate, symmetric bilinear forms over the field of two elements. The new component of this work focuses on the case of an orthogonal form on an even dimensional…

Group Theory · Mathematics 2016-12-28 Daniel Dugger

We present an abstract unifying framework for interpreting Stone-type dualities; several known dualities are seen to be instances of just one topos-theoretic phenomenon, and new dualities are introduced. In fact, infinitely many new…

Category Theory · Mathematics 2011-04-06 Olivia Caramello

We show that every involutive Hopf monoid in a complete and finitely cocomplete symmetric monoidal category gives rise to invariants of oriented surfaces defined in terms of ribbon graphs. For every ribbon graph this yields an object in the…

Quantum Algebra · Mathematics 2023-06-12 Anna-Katharina Hirmer , Catherine Meusburger

This article presents a proof of the Feldman-Moore theorem on Cartan subalgebras in W*-algebras based on the non-commutative Stone equivalence between Boolean inverse semigroups and Boolean groupoids. The proof is decomposed into two parts.…

Operator Algebras · Mathematics 2024-03-27 Jean Renault

Recently in \cite{FM, FlMo}, the language of MV-algebras was extended by adding a unary operation, an internal operator, called also a state-operator. In \cite{DD1}, a stronger version of state MV-algebras, called state-morphism MV-algebras…

Functional Analysis · Mathematics 2010-06-11 Antonio Di Nola , Anatolij Dvurecenskij , Ada Lettieri

It is well-known that the category of Kleisli algebras for a monoidal monad carries a canonical monoidal structure. We define the notion of a commutative graded monad and present a strictly two-categorical proof that Kleisli algebras for…

Category Theory · Mathematics 2022-04-05 Rowan Poklewski-Koziell

In this paper, we use the tools of nonabelian duality to formulate and prove a far-reaching generalization of the Stone-von Neumann Theorem to modular representations of actions and coactions of locally compact groups on elementary $…

Operator Algebras · Mathematics 2022-06-22 Lucas Hall , Leonard Huang , John Quigg

We show that there exist infinitely many pairs of non-homeomorphic closed oriented SOL torus bundles with the same quantum (TQFT) invariants. This follows from the arithmetic behind the conjugacy problem in $SL(2,\Z)$ and its congruence…

Geometric Topology · Mathematics 2014-11-11 Louis Funar

We suggest a new generalization of Pontryagin duality from the category of Abelian locally compact groups to a category which includes all Moore groups, i.e. groups whose irreducible representations are finite-dimensional. Objects in this…

Functional Analysis · Mathematics 2015-03-13 Yulia Kuznetsova

We characterise integral Poincar\'e duality moment-angle complexes $\mathcal{Z}_{\mathcal{K}}$ in combinatorial terms of the Fan-Wang duality of the simplicial complex $\mathcal{K}$, and consequently in algebraic terms of the Gorenstein…

Algebraic Topology · Mathematics 2022-02-01 Jelena Grbić , Matthew Staniforth

It is a study note detailing the connection between Boolean inverse monoids and ample groupoids.

Rings and Algebras · Mathematics 2026-03-27 Chi-Keung Ng , Rui Tian

For a given inverse semigroup, one can associate an \'etale groupoid which is called the universal groupoid. Our motivation is studying the relation between inverse semigroups and associated \'etale groupoids. In this paper, we focus on…

Group Theory · Mathematics 2020-02-10 Fuyuta Komura

In this paper using split extensions of group-groupoids we obtain the notion of crossed modules over group-grouoids which are also called 2-groups and we prove a categorical equivalence of these types of crossed modules and double…

Category Theory · Mathematics 2021-02-16 Sedat Temel , Tunçar Şahan , Osman Mucuk

In this paper we show that polycyclic monoids are universal objects in the class of graph inverse semigroups. In particular, we prove that a graph inverse semigroup $G(E)$ over a directed graph $E$ embeds into the polycyclic monoid…

General Topology · Mathematics 2018-10-11 Serhii Bardyla

We introduce the inverse monoid of inner partial automorphisms of a semigroup -- a tool that associates to every semigroup an inverse semigroup. When the semigroup is a group, this inverse semigroup is isomorphic to the group of inner…

We study the notion of duality in the context of graded manifolds. For graded bundles, somehow like in the case of Gelfand representation and the duality: points vs. functions, we obtain natural dual objects which belongs to a different…

Differential Geometry · Mathematics 2017-08-30 Janusz Grabowski , Michał Jóźwikowski , Mikołaj Rotkiewicz

We prove a duality theorem for quantum groupoid (weak Hopf algebra) actions that extends the well-known result for usual Hopf algebras.

Quantum Algebra · Mathematics 2007-05-23 Dmitri Nikshych

Topological T-duality is a transformation taking a gerbe on a principal torus bundle to a gerbe on a principal dual-torus bundle. We give a new geometric construction of T-dualization, which allows the duality to be extended in following…

Quantum Algebra · Mathematics 2007-10-07 Calder Daenzer

We prove a generalisation of the correspondence, due to Resende and Lawson--Lenz, between \'etale groupoids---which are topological groupoids whose source map is a local homeomorphisms---and complete pseudogroups---which are inverse monoids…

Category Theory · Mathematics 2020-04-22 Robin Cockett , Richard Garner