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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 …
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 …
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 …
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 …
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 …
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 …
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 …
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 …
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 …
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 …