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We extend the theory of d-categories, by providing an explicit description of the right mapping spaces of the d-homotopy category of an $\infty$-category. Using this description, we deduce an invariant $\infty$-categorical characterization…

Algebraic Topology · Mathematics 2019-02-13 Tomer M. Schlank , Lior Yanovski

We develop the basic theory of Maurer-Cartan simplicial sets associated to (shifted complete) $L_\infty$ algebras equipped with the action of a finite group. Our main result asserts that the inclusion of the fixed points of this equivariant…

Algebraic Topology · Mathematics 2022-12-14 José M. Moreno-Fernández , Felix Wierstra

We prove that a topological manifold (possibly with boundary) admitting a continuous cancellative binary operation is orientable. This implies that the M\"obius band admits no cancellative continuous binary operation. This answers a…

Geometric Topology · Mathematics 2016-06-23 Taras Banakh , Igor Guran , Alex Ravsky

We study homotopy-coherent commutative multiplicative structures on equivariant spaces and spectra. We define N-infinity operads, equivariant generalizations of E-infinity operads. Algebras in equivariant spectra over an N-infinity operad…

Algebraic Topology · Mathematics 2015-07-01 Andrew J. Blumberg , Michael A. Hill

It was shown in a recent paper by Boavida de Brito and Weiss that a well-known construction which to a plain (=monochromatic) topological operad associates a topological category and a functor from it to the category of finite sets is…

Algebraic Topology · Mathematics 2018-03-28 Michael S. Weiss

Using concentration-compactness arguments we prove a variant of the Brezis-Lieb-Lemma under weaker assumptions on the nonlinearity than known before. An intermediate result on the uniform continuity of superposition operators in Sobolev…

Functional Analysis · Mathematics 2016-08-17 Nils Ackermann

We take the first steps towards a better understanding of continuous orbit equivalence, i.e., topological orbit equivalence with continuous cocycles. First, we characterise continuous orbit equivalence in terms of isomorphisms of C*-crossed…

Dynamical Systems · Mathematics 2015-03-06 Xin Li

We review several well-known operads of compactified configuration spaces and construct several new such operads, C, in the category of smooth manifolds with corners whose complexes of fundamental chains give us (i) the 2-coloured operad of…

Quantum Algebra · Mathematics 2011-04-22 S. A. Merkulov

The category of differential graded operads is a cofibrantly generated model category and as such inherits simplicial mapping spaces. The vertices of an operad mapping space are just operad morphisms. The 1-simplices represent homotopies…

Algebraic Topology · Mathematics 2017-04-06 Benoit Fresse

First we describe a class of homotopy Frobenius algebras via cyclic operads which we call cyclic $A_\infty$ algebras. We then define a suitable new combinatorial operad which acts on the Hochschild cochains of such an algebra in a manner…

Algebraic Topology · Mathematics 2014-09-22 Benjamin C. Ward

Let overline{M}_{g,n} be the moduli space of stable algebraic curves of genus g with n marked points. With the operations which relate the different moduli spaces identifying marked points, the family (overline{M}_{g,n})_{g,n} is a modular…

Algebraic Geometry · Mathematics 2007-05-23 F. Guillen , V. Navarro , P. Pascual , A. Roig

We compare two approaches to the homotopy theory of infinity-operads. One of them, the theory of dendroidal sets, is based on an extension of the theory of simplicial sets and infinity-categories which replaces simplices by trees. The other…

Algebraic Topology · Mathematics 2015-01-30 Gijs Heuts , Vladimir Hinich , Ieke Moerdijk

We prove a general extension theorem for holomorphic line bundles on reduced complex spaces, equipped with singular hermitian metrics, whose curvature currents can be extended as positive, closed currents. The result has applications to…

Complex Variables · Mathematics 2017-03-31 Georg Schumacher

We prove, under mild assumptions, that a Quillen equivalence between symmetric monoidal model categories gives rise to a Quillen equivalence between their model categories of (non-symmetric) operads, and also between model categories of…

Algebraic Topology · Mathematics 2014-11-11 Fernando Muro

We prove convergence and compatibility of iterated bulk and boundary operator product expansions (OPEs) in two-dimensional conformal field theory with locally $C_1$-cofinite chiral symmetry. For each tree, we give an explicit domain of…

Quantum Algebra · Mathematics 2026-05-27 Yuto Moriwaki

We establish a connection between two well-studied spaces of countable groups: the space of group operations and the space of marked groups. This connection shows that the two spaces are equivalent in terms of generic properties in the…

Logic · Mathematics 2025-10-22 Tamás Kátay

We study ordered configuration spaces of compact manifolds with boundary. We show that for a large class of such manifolds, the real homotopy type of the configuration spaces only depends on the real homotopy type of the pair consisting of…

Algebraic Topology · Mathematics 2024-06-25 Ricardo Campos , Najib Idrissi , Pascal Lambrechts , Thomas Willwacher

It is proved recently by Benamara-Nikolski that a contraction having finite defects and spectrum not filling in the closed unit disc, is similar to a normal operator if and only if it has the so-called linear resolvent growth property. We…

Spectral Theory · Mathematics 2007-05-23 Stanislav Kupin

The homotopy category of $N_\infty$ operads is equivalent to a finite lattice, and as the ambient group varies, there are various image constructions between these lattices. In this paper, we explain how to lift this algebraic structure…

Algebraic Topology · Mathematics 2019-09-27 Jonathan Rubin

We show that the category OS of operator spaces, with complete contractions as morphisms, is locally countably presentable. This result, together with its symmetric monoidal closed structure with respect to the projective tensor product of…

Category Theory · Mathematics 2024-12-31 Bert Lindenhovius , Vladimir Zamdzhiev