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Part of higher category theory that for instance in Algebraic Topology enables us to capture finer homotopic distinctions. As in say Eilenberg-Maclane spaces.

8 votes
Accepted

Homotopy (co)limits in oo-categories vs model categories

The ∞-categorical limits (respectively colimits) are given by the right (respectively left) adjoint of the constant diagram functor $$C→C^I,$$ where $I$ is the indexing category and $C$ is the ∞-categ …
Dmitri Pavlov's user avatar
3 votes
Accepted

Monochromatic infinity operads as algebras over the "operad operad"

Yes, combine Corollary 9.4.1 and Theorem 7.11 of arXiv:1410.5675, for example. This topic is also examined more explicitly in the work of Chu and Haugseng, arXiv:1707.08049. Corollary 5.1.13 shows tha …
Dmitri Pavlov's user avatar
6 votes
Accepted

Weak composition rule for simplicial categories

The most obvious approach is to consider simplicial $\def\Ai{{\sf A}_∞}\Ai$-categories, where $\Ai$ denotes a nonsymmetric operad in simplicial sets that is weakly equivalent to the terminal operad, i …
Dmitri Pavlov's user avatar
5 votes
Accepted

$\infty$-groupoid iff Kan condition

A good place to start is the following characterization of nerves of ordinary groupoids: A category is a groupoid if and only if its nerve is a Kan complex. Filling the outer horns is precisely what …
Dmitri Pavlov's user avatar
2 votes
Accepted

Homotopical properties of powersets of simplicial sets

The first question has a negative answer, given by the simplicial set $\def\Exi{{\sf Ex}^{\sf\infty}}X=\Exi Y$, where $Y$ is a simplicial set generated by vertices $a,b,b',c,c',d,d'$, 1-simplices $ab, …
Dmitri Pavlov's user avatar
3 votes
Accepted

Simplicial objects in quasicategory which come from homotopy coherent nerve

It is easy to construct counterexamples already for the full subcategory $\{[0],[1]\}⊂Δ$. The category $\cal C$ can be constructed by applying the nerve functor to hom-objects of a category $D$ enric …
Dmitri Pavlov's user avatar
12 votes
Accepted

The derived category does not satisfy descent - example

Consider the canonical functor $H$ from the homotopy category of homotopy coherent descent data in the ∞-category of coherent sheaves to the category of descent data in the derived category of coheren …
Dmitri Pavlov's user avatar
5 votes
Accepted

Internal hom in $(\infty,2)$-categories

Yes because the model structure on Fun(Δ^op, sSet) is a cartesian model structure. This follows from the fact that the Joyal model structure is cartesian, and §10, §11 in Rezk's paper “A model for the …
Dmitri Pavlov's user avatar
2 votes
Accepted

Coefficient (or target) category for factorization homology

One rich source of examples is that every combinatorial symmetric monoidal model category gives rise to such a category V. In particular, this covers all the examples in the main post, including cdga …
Dmitri Pavlov's user avatar
1 vote

$k$-linear $\infty$ stable categories and dg categories

The derived tensor product of dg-categories was explored by Toën, see his article The homotopy theory of dg-categories and derived Morita theory, in particular, Section 4, where Toën explains how to …
Dmitri Pavlov's user avatar
8 votes

Examples of categories cofibered in groupoids

Categories (co)fibered in groupoids are used to define stacks (stacks in groupoids, to be precise), so any introduction to stacks will do. For stacks on smooth manifolds, see, for example, Ieke Moerd …
Dmitri Pavlov's user avatar
1 vote

A question about cofiber diagrams in stable $\infty$-categories

Working in the stable ∞-category of morphisms, whose objects are morphisms and morphisms are commutative squares with a choice of homotopy, the statement $δ≃α$ up to some contractile space of homotop …
Dmitri Pavlov's user avatar
6 votes
Accepted

Geometric realisation of smooth $\infty$-stacks

The case when $M$ is a smooth manifold follows from the smooth Oka principle. See there for an expository account of the argument and references to additional sources. Indeed, the left side of (*) is …
Dmitri Pavlov's user avatar
6 votes
Accepted

Are $E_k$ monoids higher categories?

This is closely related to the Baez–Dolan stabilization hypothesis. There are numerous proofs of this statement. One line of reasoning is to establish a general 1-category statement first: given a sym …
Dmitri Pavlov's user avatar
5 votes
Accepted

Derived functors out of an unbounded derived $\infty$-category

An account of derived functors between ∞-categories equipped with weak equivalences and fibrations can be found in Section 7.5 of Cisinski's Higher Categories and Homotopical Algebra. This setting is …
Dmitri Pavlov's user avatar

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