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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 …
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 …
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 …
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 …
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, …
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 …
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 …
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 …
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 …
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 …
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 …
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 …
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 …
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 …
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 …