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Homotopy theory, homological algebra, algebraic treatments of manifolds.
4
votes
2
answers
1k
views
Finite simplicial sets
A finite simplicial set is a simplicial set having only a finite number of non degenerate simplicies. It is not hard to show that every finite simplicial set has only a finite number of simplicies in …
7
votes
(infinity,1)-categories directly from model categories
Here is an extended comment regarding Charles answer, including some more references.
In this paper, Theorem 2.5.9, it is shown that every model category (not necessarily a combinatorial one) has all …
3
votes
1
answer
351
views
Equivalent definition of a Kan fibration
It is known (follows for example from Proposition 4.2 of Simplicial Homotopy Theory by Goerss and Jardine) that a Kan-fibration can be defined as a map having the right lifting property with respect t …
4
votes
$(\infty,1)$-categories and model categories
The functor $F$ you are looking for can be described as follows. Given a model category $M$, with class of weak equivalences $W$, one may associate to it an $\infty$-category $M_\infty$, equipped with …
8
votes
Accepted
Infinity category of functors from a relative category to a model category
The following is taken from Section 2.3.2 of
http://arxiv.org/abs/math/0207028
Let $C$ be a small simplicial category, $S\subseteq C$ a simplicial subcategory and $M$ a simplicial combinatorial mode …
2
votes
Is there a notion of a “model category which admits left Bousfield localization?”
Here is another family of examples of non-cofibrantly generated model categories which admit left Bousfield localization with respect to certain classes of maps. Let $C$ be a proper simplicial model c …
12
votes
2
answers
649
views
Exponentiation in finite simplicial sets
A finite simplicial set is a simplicial set having only a finite number of non degenerate simplicies. My question is: if $A$ and $B$ are finite simplicial sets, does this imply that the simplicial set …
4
votes
1
answer
254
views
Is the simplicial set $(\Delta_3/\partial \Delta_3)^{\Delta_1}$ finite?
A simplicial set is called finite if it has only a finite number of non degenerate simplicies (or equivalently, if its number of $n$-simplicies grows polynomially with $n$). In an answer to a previou …
9
votes
Accepted
On combinatorial and cellular model categories and infinity categories
If you believe Vopěnka's principle then any cofibrantly generated model category is Quillen equivalent to a combinatorial one and thus its underlying $\infty$-category is presentable. It follows that …
5
votes
Reference for a generalization of Γ-spaces to monoidal model categories
The following paper by Tom Leinster
http://arxiv.org/abs/math/0002180
defines for any symmetric monoidal model category $M$ and any (symmetric) operad $P$ (in $Set$) the notion of an $\infty$-algebr …
2
votes
A fibrant-objects structure on Top
There was a mistake in an earlier version of the paper that you mention. If you define $\pi_0$-fibrations and $\pi_0$-equivalences the way that you did, they do not give the structure of a category o …
9
votes
0
answers
748
views
Standard model structures on $Top$
Call a model structure on $Top$ (the category of topological spaces) standard, if the weak equivalences are the weak homotopy equivalences. In this nLab page, two standard model structures on $Top$ ar …
20
votes
2
answers
1k
views
The Gelfand duality for pro-$C^*$-algebras
The Gelfand duality says that
$$X\to C(X)$$
is a contravariant equivalence between the category of compact Hausdorff spaces and continuous maps and the category of commutative unital $C^*$-algebras …