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A model category is a category equipped with notions of weak equivalences, fibrations and cofibrations allowing to run arguments similar to those of classical homotopy theory.

4 votes
Accepted

Model for the (infinity,1)-category of functors preserving certain homotopy limits

The $(\infty,1)$-category of presheaves on any small $(\infty,1)$-category $C$ is presented by the model structure of simplicial presheaves on any simplicial category which incarnates $C$. So if $M$ …
Glorfindel's user avatar
  • 2,821
8 votes

How to get by with only functorial cylindrical objects?

You might be interested in looking into enriched model categories. If $\mathcal{V}$ is a monoidal model category (with cofibrant unit, for simplicity) and $\mathcal{C}$ is a $\mathcal{V}$-model categ …
Mike Shulman's user avatar
  • 66.8k
5 votes
Accepted

What is the right notion of a functor from an internal topological category to a topological...

I don't believe it is possible to recover the "correct" notion of "functor $\mathcal{C}\to \rm Top$", as described at the other question you linked to, by viewing $\rm Top$ only as a topologically enr …
Mike Shulman's user avatar
  • 66.8k
5 votes
Accepted

Fibrant replacement of an injective model category of enriched diagrams

Section 8 of my paper All (∞,1)-toposes have strict univalent universes shows that under fairly general conditions, injective fibrant replacements can be given by cobar constructions (e.g. the dual of …
Mike Shulman's user avatar
  • 66.8k
9 votes

Model categories with uniqueness

As Denis-Charles said in a comment, if you require the unique lifting property on a weak factorization system, it becomes a "unique" or "orthogonal" factorization system. In the paper Bousfield local …
Mike Shulman's user avatar
  • 66.8k
6 votes

Is the canonical model structure on strict $\infty$-Cat left proper?

The canonical model structure on 2-Cat is left proper. This is proven in Steve Lack's original paper A Quillen model structure for 2-categories that constructs this model category. The proof involve …
Mike Shulman's user avatar
  • 66.8k
12 votes

How should I think about presentable $\infty$-categories?

Just to be a little bit contrary, let me point out one concrete reason that locally presentable categories are not aesthetic: it is unclear whether they have any analogue in constructive mathematics. …
Mike Shulman's user avatar
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9 votes
Accepted

Example of non accessible model categories

I don't know whether set-theoretic hypotheses are necessary to answer this question. But if we assume the negation of Vopěnka's principle, here is an example: by Example 6.12 of Adamek-Rosicky Locall …
Mike Shulman's user avatar
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1 vote
Accepted

Reedy model structures on oplax limits

I think the paper I was thinking of when I asked this question was probably Markus Spitzweck, Homotopy limits of model categories over inverse index categories, JPAA 214:6 (2010) although he only …
Mike Shulman's user avatar
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7 votes
Accepted

simplicial objects in a model category

No, it is not. If what you mean by $\rm colim_n$ is the actual colimit of $F$ as a diagram of shape $\Delta$, then this colimit is isomorphic to the coequalizer of the two maps $F([1]) \rightrightarr …
Mike Shulman's user avatar
  • 66.8k
6 votes

Need M combinatorial for existence of injective model structure on $M^G$?

It seems very unlikely to me that you will be able to get any useful handle on the generating acyclic cofibrations in the injective model structure, even in simple cases like when $I$ is the delooping …
David White's user avatar
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3 votes

Need M combinatorial for existence of injective model structure on $M^G$?

This is probably not the sort of answer that the original question was going for, since you said you were happy to assume cofibrant generation but not combinatoriality (i.e. not local presentability), …
David Roberts's user avatar
  • 35.5k
3 votes

Is the projective model structure simplicial?

The general case is noted in A.3.3.4 in Higher topos theory. Actually it's quite easy to prove, using the characterization of simplicial model categories in terms of powers (cotensors), since the pow …
Mike Shulman's user avatar
  • 66.8k
6 votes

Do combinatorial model categories and Quillen adjunctions model presentable $\infty$-categor...

I think it shouldn't be too hard to show using Dugger's technology that $N$ is full, i.e. essentially surjective on 1-morphisms. Suppose $C,D$ are combinatorial model categories and $f : N C \to N D$ …
Mike Shulman's user avatar
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7 votes
Accepted

Co/fibrant replacements via coend calculus

Addressing this sort of question was one of the main goals of math/0610194. The best answer I was able to give is that if $B$ has a suitable model structure with respect to which $F$ is objectwise fi …
Mike Shulman's user avatar
  • 66.8k

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