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We prove a localisation theorem for the K-theory of filtering subcategories of exact $\infty$-categories which subsumes the localisation theorem for stable $\infty$-categories, Quillen's localisation theorem for abelian categories, and…

K-Theory and Homology · Mathematics 2025-10-09 Christoph Winges

Building on work of Marta Bunge in the one-categorical case, we characterize when a given model category is Quillen equivalent to a presheaf category with the projective model structure. This involves introducing a notion of homotopy atoms,…

Algebraic Topology · Mathematics 2024-12-31 Boris Chorny , David White

Working over an arbitrary field, we define compact semisimple 2-categories, and show that every compact semisimple 2-category is equivalent to the 2-category of separable module 1-categories over a finite semisimple tensor 1-category. Then,…

Quantum Algebra · Mathematics 2023-10-27 Thibault D. Décoppet

We redefine the Baum-Connes assembly map using simplicial approximation in the equivariant Kasparov category. This new interpretation is ideal for studying functorial properties and gives analogues of the assembly maps for all equivariant…

K-Theory and Homology · Mathematics 2015-10-23 Ralf Meyer , Ryszard Nest

In this thesis we define the notion of a locally stratified space. Locally stratified spaces are particular kinds of streams and d-spaces which are locally modelled on stratified spaces. We construct a locally presentable and cartesian…

Algebraic Topology · Mathematics 2020-04-06 Stefano Nicotra

We introduce the theory of biset functors defined on finite categories. Previously, biset functors have been defined on groups, and in that context they are closely related to Mackey functors. Standard examples on groups include…

Representation Theory · Mathematics 2023-07-18 Peter Webb

This paper examines $\mathbb{Z}$-graded manifolds as semiformal homogeneity structures, comparing two polynomial filtrations from their local models. In finite dimensions, these are componentwise equivalent, yielding isomorphic graded…

Differential Geometry · Mathematics 2026-05-13 Martha Valentina Guarin Escudero , Alexei Kotov

We investigate categorical and amalgamation properties of the functor Idc assigning to every partially ordered abelian group G its semilattice of compact ideals Idc G. Our main result is the following. Theorem 1. Every diagram of finite…

General Mathematics · Mathematics 2007-05-23 Jiri Tuma , Friedrich Wehrung

In this note we study symmetric monoidal functors from a symmetric monoidal 1-category to a cartesian symmetric monoidal $\infty$-category, which are in addition hypersheaves for a certain topology. We prove a symmetric monoidal version of…

Category Theory · Mathematics 2024-12-06 Josefien Kuijper

We prove a relative version of the realization theorem for $h_\infty$-diagrams in case that the underlying diagram subcategory is factorization-closed.

Algebraic Topology · Mathematics 2018-10-24 Gerd Laures

We prove the theorem stated in the title. More precisely, we show the stronger statement that every symmetric monoidal left adjoint functor between presentably symmetric monoidal infinity-categories is represented by a strong symmetric…

Algebraic Topology · Mathematics 2017-10-03 Thomas Nikolaus , Steffen Sagave

This paper is the third paper of a series devoted to higher dimensional transition systems. The preceding paper proved the existence of a left determined model structure on the category of cubical transition systems. In this sequel, it is…

Algebraic Topology · Mathematics 2014-01-30 Philippe Gaucher

We distinguish between faint, weak, strong and strict localizations of categories at morphism families and show that this framework captures the different types of derived functors that are considered in the literature. More precisely, we…

Algebraic Topology · Mathematics 2021-09-28 Alisa Govzmann , Damjan Pištalo , Norbert Poncin

Much research has been done on structures equivalent to topological or simplicial groups. In this paper, we consider instead simplicial monoids. In particular, we show that the usual model category structure on the category of simplicial…

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

We prove that the derived Fukaya category of the Lefschetz fibration defined by a Brieskorn-Pham polynomial is equivalent to the triangulated category of singularities associated with the same polynomial together with a grading by an…

Symplectic Geometry · Mathematics 2010-03-29 Masahiro Futaki , Kazushi Ueda

In this paper, we provide a simple proof for the fact that two simplicial complexes are isomorphic if and only if their associated Stanley-Reisner rings, or their associated facet rings are isomorphic as $K$-algebras. As a consequence, we…

Commutative Algebra · Mathematics 2010-10-12 Rashid Zaare-Nahandi

We define the Grothendieck-Witt category over a fixed ground ring. In order to study the structure of this category, we introduce the general theory of Gysin functors and their associated categories of correspondences. The latter…

Algebraic Topology · Mathematics 2016-02-03 Daniel Dugger

We construct an exact tensor functor from the category $\mathcal{A}$ of finite-dimensional graded modules over the quiver Hecke algebra of type $A_\infty$ to the category $\mathscr C_{B^{(1)}_n}$ of finite-dimensional integrable modules…

Representation Theory · Mathematics 2017-10-19 Masaki Kashiwara , Myungho Kim , Se-jin Oh

Constructions of spectra from symmetric monoidal categories are typically functorial with respect to strict structure-preserving maps, but often the maps of interest are merely lax monoidal. We describe conditions under which one can…

Algebraic Topology · Mathematics 2017-09-26 Nick Gurski , Niles Johnson , Angélica M. Osorno

This is a continuation, completion, and generalization of our previous joint work with B. Chorny. We supply model structures and Quillen equivalences underlying Goodwillie's constructions on the homotopy level for functors between…

Algebraic Topology · Mathematics 2014-11-26 Georg Biedermann , Oliver Röndigs