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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.

6 votes
Accepted

When does a cofibrantly generated model category have this factorization property?

I've encountered that condition a few time. Here is what I know about it: If that property is satisfied for a model category $M$ then the full subcategory $C$ of finite $I$-cell complex is itself a Br …
Simon Henry's user avatar
  • 42.4k
4 votes

Does $\infty$-categorical localization commute with taking directed fibered products?

Here is a counter example in the general case: Take $E = [1] = 0 \to 1 $. $D = \{0\} \coprod \{1\} $ and $C = \{1\}$. where all maps are weak equivalence. The lax-pullback is $\{id:1 \to 1\}$, and the …
Simon Henry's user avatar
  • 42.4k
5 votes
Accepted

Is there a "geometric definition" of globular $\infty$-groupoids/categories?

In short there isn't: the problem is that if you just have globular sets - and if you want $k$-cells to model $k$-arrows following the globular structure - then globular sets have no way of expressing …
Simon Henry's user avatar
  • 42.4k
9 votes
0 answers
192 views

Every locally presentable $\infty$-category can be presented by a proper model category

Is there an argument in the litterature that show that every locally presentable $\infty$-category is equivalent to the localization of proper combinatorial Quillen model category ? Of course if one r …
1 vote

Bousfield localization of a left proper accessible model category

In combinatorial and accessible weak model categories (also on ArXiv) I've studied Bousfield localization of weak and semi-model categories in both the combinatorial and accessible case. In particular …
Simon Henry's user avatar
  • 42.4k
13 votes

sSet-enriched categories, quasi-categories and the model-independent theory

This has not been done, and there are good reasons for it: While $sSet$-enriched categories are indeed very good to easily get examples of $\infty$-categories, they are very bad at understanding what …
Simon Henry's user avatar
  • 42.4k
4 votes
Accepted

Can Reedy cofibrations be monomorphisms?

I believe what you are after is the notion of "elegant Reedy category" This sort of things isn't true for a general Reedy category, but for an elegant one $R$ (see the link for the definition) if $\ma …
Simon Henry's user avatar
  • 42.4k
8 votes
2 answers
329 views

example of "really" non-existent transferred model structure

I am looking for an example where a transferred model structure fails to exist, even if one is willing to work with semi-model category. But let me be more precise: Let's say I have a combinatorial mo …
15 votes
1 answer
494 views

On diagrams in model categories and rectification

For a model category $C$, I'm denoting $h_\infty(C)$ the associated $\infty$-category (for example its Dwyer-Kan localization at weak equivalences, or if $C$ is simplicial the simplicial nerve of the …
2 votes
Accepted

Does the monoidal structure on semisimplicial sets preserve fibrant objects?

It is not the case: the terminal semi-simplicial set $1$ is obviously fibrant but as I will show below the geometric product $1 \otimes 1$ is not fibrant. 1) What does $1 \otimes 1$ look like ? So, $1 …
Simon Henry's user avatar
  • 42.4k
7 votes
1 answer
295 views

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

Is the canonical (or Folk) model structure on the category of (strict) $\infty$-categories as constructed by Lafont, Métayer and Worytkiewicz in A folk model structure on omega-cat left proper ? All i …
3 votes
Accepted

Euclidean model structure on multipointed $d$-spaces

As mentioned by David White in the comment, I've recently proved that left induced model structure exists (without any kind of large cardinal axiom) for any "tractable" class of cofibrations on a loc …
Simon Henry's user avatar
  • 42.4k
9 votes
0 answers
163 views

Proper model category for "categories with finite limits"

I'm looking for a Quillen model category which model the $2$-category of 'small category with finite limits (and functors between them preserving finite limits)': Left proper, right proper, Enriched …
7 votes
Accepted

Almost combinatorial accessible model categories

Actually, you can, and you don't need accessibility (local presentability of the underlying category is enough). Under your assumption, for each $i:A \to B$ a generating cofibration, take $B \coprod_A …
David Roberts's user avatar
  • 35.5k
16 votes
2 answers
912 views

Counter-example to the existence of left Bousfield localization of combinatorial model category

Is there any known example of a combinatorial model category $C$ together with a set of map $S$ such that the left Bousefield localization of $C$ at $S$ does not exists ? It is well known to exists w …

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