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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 …
Ilan Barnea's user avatar
  • 1,354
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 …
Ilan Barnea's user avatar
  • 1,354
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 …
Ilan Barnea's user avatar
  • 1,354
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 …
Ilan Barnea's user avatar
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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 …
Ilan Barnea's user avatar
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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 …
Ilan Barnea's user avatar
  • 1,354
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 …
Ilan Barnea's user avatar
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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 …
Ilan Barnea's user avatar
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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 …
Ilan Barnea's user avatar
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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 …
Ilan Barnea's user avatar
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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 …
Ilan Barnea's user avatar
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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 …
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