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We prove that the algebra $\cal{A}$ of chord diagrams, the dual to the associated graded algebra of Vassiliev knot invariants, is isomorphic to the universal enveloping algebra of a Casimir Lie algebra in a certain tensor category (the PROP…

Quantum Algebra · Mathematics 2009-09-25 Vladimir Hinich , Arkady Vaintrob

We give a simple generalisation of a theorem of Morita, which leads to a great number of relations among tautological classes on moduli spaces of curves.

Algebraic Topology · Mathematics 2013-01-08 Oscar Randal-Williams

We show that if $M$ and $N$ are $C^{*}$-algebras and if $E$ (resp. $F$) is a $C^{*}$-correspondence over $M$ (resp. $N$), then a Morita equivalence between $(E,M)$ and $(F,N)$ implements a isometric functor between the categories of Hilbert…

Operator Algebras · Mathematics 2010-07-21 Paul S. Muhly , Baruch Solel

Let $\mathbb{E}_d$ denote the little discs operad for $1 \le d \le \infty$ and let $\mathcal{C}$ be an $\infty$-category all of whose mapping spaces are $n$-truncated. We prove that when considering $\mathbb{E}_d$-monoids in $\mathcal{C}$,…

Algebraic Topology · Mathematics 2023-04-26 Shaul Barkan

This text, based on the author's Bachelor's thesis, introduces the theory of Algebraic Operads, a mathematical formalism that provides a unifying framework for modern algebra. We demonstrate how the fundamental theories of associative,…

Quantum Algebra · Mathematics 2025-11-11 Felicia Ferraioli

We study duals for objects and adjoints for $k$-morphisms in $\operatorname{Alg}_n(\mathcal{S})$, an $(\infty,n+N)$-category that models a higher Morita category for $E_n$ algebra objects in a symmetric monoidal $(\infty,N)$-category…

Category Theory · Mathematics 2018-06-28 Owen Gwilliam , Claudia Scheimbauer

In this article we develop a unified framework for proving Morita invariance of cohomology theories associated to Lie groupoids. Our approach is to view these cohomology theories as arising from sheaves of modules on the nerve of the…

Differential Geometry · Mathematics 2025-09-10 Xiang Tang , Joel Villatoro

We classify derived-discrete algebras over the real numbers up to Morita equivalence, using the classification of complex derived-discrete algebras in [{\sc D. Vossieck}, {\em The algebras with discrete derived category}, J. Algebra {\bf…

Representation Theory · Mathematics 2025-12-09 Jie Li

Motivated by algebraic structures appearing in Rational Conformal Field Theory we study a construction associating to an algebra in a monoidal category a commutative algebra ({\em full centre}) in the monoidal centre of the monoidal…

Category Theory · Mathematics 2010-01-31 Alexei Davydov

There are two approaches to projective representation theory of symmetric and alternating groups, which are powerful enough to work for modular representations. One is based on Sergeev duality, which connects projective representation…

Representation Theory · Mathematics 2010-11-03 Alexander Kleshchev , Vladimir Shchigolev

We prove that two semigroups with local units are Morita equivalent if and only if they have a joint enlargement. This approach to Morita theory provides a natural framework for understanding McAlister's theory of the local structure of…

Rings and Algebras · Mathematics 2010-03-30 Mark V. Lawson

We study some formality criteria for differential graded algebras over differential graded operads. This unifies and generalizes other known approaches like the ones by Manetti and Kaledin. In particular, we construct general operadic…

Quantum Algebra · Mathematics 2020-05-12 Valerio Melani , Marcel Rubió

It was shown by Connes, Douglas, Schwarz[1] that one can compactify M(atrix) theory on noncommutative torus. We prove that compactifications on Morita equivalent tori are physically equivalent. This statement can be considered as a…

High Energy Physics - Theory · Physics 2010-11-19 Albert Schwarz

Over an arbitrary field, we prove that the relative 2-Deligne tensor product of two separable module 2-categories over a compact semisimple tensor 2-category exists. This allows us to consider the Morita 4-category of compact semisimple…

Category Theory · Mathematics 2024-11-08 Thibault D. Décoppet

In this paper, we study equivalences between the categories of quasi-coherent sheaves on non-commutative noetherian schemes. In particular, give a new proof of Caldararu's conjecture about Morita equivalences of Azumaya algebras on…

Algebraic Geometry · Mathematics 2022-06-30 Igor Burban , Yuriy Drozd

We characterize the inverse semigroups that are Morita equivalent to graph inverse semigroups. We also consider a generalization to inverse semigroups associated with left cancellative categories.

Group Theory · Mathematics 2023-07-25 Martha Du Preez , Robert Grimley , Evan Lira , David Milan , Shreyas Ramamurthy

We give a Morita equivalence theorem for so-called cyclotomic quotients of affine Hecke algebras of type B and D, in the spirit of a classical result of Dipper-Mathas in type A for Ariki-Koike algebras. As a consequence, the representation…

Representation Theory · Mathematics 2021-06-04 Loïc Poulain d'Andecy , Salim Rostam

A theorem by Pridham and Lurie provides an equivalence between formal moduli problems and Lie algebras in characteristic zero. In his work, Lurie has distilled the axioms that the algebras appearing in the formal moduli problem need to…

Algebraic Topology · Mathematics 2022-11-22 Ramkumar Ramachandra

Comodules over Hopf algebroids are of central importance in algebraic topology. It is well-known that a Hopf algebroid is the same thing as a presheaf of groupoids on Aff, the opposite category of commutative rings. We show in this paper…

Algebraic Topology · Mathematics 2007-05-23 Mark Hovey

Let A be a self-injective algebra over an algebraically closed field k. We show that if an A-module M of complexity one has an open orbit in the variety of d-dimensional A-modules, then M is periodic. As a corollary we see that any simple…

Representation Theory · Mathematics 2012-03-13 Alex Dugas