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We introduce twisted arrow categories of operads and of algebras over operads. Up to equivalence of categories, the simplex category $\Delta$, Segal's category $\Gamma$, Connes cyclic category $\Lambda$, Moerdijk-Weiss dendroidal category…

Algebraic Topology · Mathematics 2022-05-03 Sergei Burkin

Notions and techniques of enriched category theory can be used to study topological structures, like metric spaces, topological spaces and approach spaces, in the context of topological theories. Recently in [D. Hofmann, Injective spaces…

Category Theory · Mathematics 2008-07-28 Maria Manuel Clementino , Dirk Hofmann

We study the convergence of these operators in a weighted space of functions on a positive semi-axis and estimate the approximation by using a new type of weighted modulus of continuity and error estimation.

Classical Analysis and ODEs · Mathematics 2016-06-22 Preeti Sharma , Vishnu Narayan Mishra

There are basically two interesting breeds of $E_2$ operads, those that detect loop spaces and those that solve Deligne's conjecture. The former deformation retract to Milgram's space obtained by gluing together permutahedra at their faces.…

Algebraic Topology · Mathematics 2017-06-02 Ralph M. Kaufmann , Yongheng Zhang

We describe the Segal $K$-theory of the symmetric monoidal category of finite-dimensional vector spaces over a perfect field $\mathbb{F}$ together with an automorphism, or, equivalently, the group-completion of the $E_\infty$-algebra of…

K-Theory and Homology · Mathematics 2024-10-21 Andrea Bianchi , Florian Kranhold

In the enriched setting, the notions of injective and projective model structures on a category of enriched diagrams also make sense. In this paper, we prove the existence of these model structures on enriched diagram categories under local…

Algebraic Topology · Mathematics 2020-01-17 Lyne Moser

This paper investigates the absolute values on $\mathbb{Z}$ valued in the upper reals (i.e. reals for which only a right Dedekind section is given). These necessarily include multiplicative seminorms corresponding to the finite prime fields…

Number Theory · Mathematics 2023-08-30 Ming Ng , Steven Vickers

We construct a localization for operads with respect to one-ary operations based on the Dwyer-Kan hammock localization. For an operad O and a sub-monoid of one-ary operations W we associate an operad LO and a canonical map O to LO which…

Category Theory · Mathematics 2017-09-18 Maria Basterra , Irina Bobkova , Kate Ponto , Ulrike Tillmann , Sarah Yeakel

Motivated by the operad built from moduli spaces of Riemann surfaces, we consider a general class of operads in the category of spaces that satisfy certain homological stability conditions. We prove that such operads are infinite loop space…

Algebraic Topology · Mathematics 2017-09-18 Maria Basterra , Irina Bobkova , Kate Ponto , Ulrike Tillmann , Sarah Yeakel

In this paper we introduce a notion of {\it generalized operad} containing as special cases various kinds of operad--like objects: ordinary, cyclic, modular, properads etc. We then construct inner cohomomorphism objects in their categories…

Category Theory · Mathematics 2011-01-10 D. Borisov , Yu. I. Manin

We extend some results of Carderi and Le Ma\^itre on full groups in the probability context to the infinite measure one: there exists at most one Polish group topology (refining the weak topology and coarser than the uniform topology) on an…

Dynamical Systems · Mathematics 2025-11-27 Fabien Hoareau

This paper provides an explicit cofibrant resolution of the operad encoding Batalin-Vilkovisky algebras. Thus it defines the notion of homotopy Batalin-Vilkovisky algebras with the required homotopy properties. To define this resolution we…

Quantum Algebra · Mathematics 2011-03-31 Imma Galvez-Carrillo , Andy Tonks , Bruno Vallette

This is an expository article about operads in homotopy theory written as a chapter for an upcoming book. It concentrates on what the author views as the basic topics in the homotopy theory of operadic algebras: the definition of operads,…

Algebraic Topology · Mathematics 2022-01-04 Michael A. Mandell

We investigate $\mathrm{LMod}_{R}(\mathcal{V})$-enriched $\infty$-categories, where $R$ is an $\mathbb{E}_2$-ring in a presentable $\mathbb{E}_2$-monoidal $\infty$-category $\mathcal{V}$, using $\mathcal{V}$-enriched $\infty$-category…

Category Theory · Mathematics 2025-02-25 Matteo Doni

We associate to every action of a Polish group on a standard probability space a Polish group that we call the orbit full group. For discrete groups, we recover the well-known full groups of pmp equivalence relations equipped with the…

Group Theory · Mathematics 2014-11-24 Alessandro Carderi , François Le Maître

We develop operator renewal theory for flows and apply this to infinite ergodic theory. In particular we obtain results on mixing for a large class of infinite measure semiflows. Examples of systems covered by our results include…

Dynamical Systems · Mathematics 2014-04-11 Ian Melbourne , Dalia Terhesiu

We study algorithmic randomness notions via effective versions of almost-everywhere theorems from analysis and ergodic theory. The effectivization is in terms of objects described by a computably enumerable set, such as lower semicomputable…

Logic · Mathematics 2016-03-22 Kenshi Miyabe , André Nies , Jing Zhang

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

In this paper we give a summary of the comparisons between different definitions of so-called (\infty,1)-categories, which are considered to be models for \infty-categories whose n-morphisms are all invertible for n>1. They are also, from…

Algebraic Topology · Mathematics 2007-05-23 Julia E. Bergner

We show that the Rezk classification diagram of a relative category admitting a homotopical version of the two-sided calculus of fractions is a Segal space up to Reedy-fibrant replacement. This generalizes the result of Rezk and Bergner on…

Category Theory · Mathematics 2015-05-19 Zhen Lin Low , Aaron Mazel-Gee
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