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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.
3
votes
Model bicategories
Funny that someone upped this question of mine today. After ten years I can say that yes: there are at least three examples of "model bicategory", each irreducible to one another, but in a sense diffe …
10
votes
Homotopical algebra is not concrete
This stream of thought led to the following preprint that has been on the arXiv for a few days. https://arxiv.org/abs/1704.00303
This is not an act of self-promotion, but maybe some of the interested …
4
votes
0
answers
118
views
Conditions on a Quillen functor so that its comonad is homotopy-full
I am looking for an answer to the following question:
Let $F : {\cal C} \to {\cal D}$ be a left Quillen functor between combinatorial model categories; let $\tilde F \dashv \tilde G$ be the induced a …
6
votes
0
answers
147
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Model structures on varieties of algebras
I say that a category of (say) algebras for a monad[¹] $\text{Alg}(\mathbb T)$ is "uninteresting" if the only model structures on $\text{Alg}(\mathbb T)$ result as transfer of the nine model structure …
8
votes
2
answers
349
views
Co/fibrant replacements via coend calculus
In the paper
Cordier, Jean-Marc, and Timothy Porter. "Homotopy coherent category theory." Transactions of the American Mathematical Society 349.1 (1997): 1-54.
the authors define a notion of coh …
30
votes
1
answer
1k
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Homotopical algebra is not concrete
There is this old result by Freyd that "homotopy is not concrete":
Freyd, Peter. "Homotopy is not concrete." The Steenrod Algebra and Its Applications: A Conference to Celebrate NE Steenrod's Six …
6
votes
Accepted
Reference for t-structures on stable model categories
one can always define a t-structure on a stable model category as a t-structure on its homotopy category
This is a definition, but it's extremely unsatisfying and completely unenlightening.
The …
6
votes
2
answers
334
views
Model bicategories
From a conceptual point of view, the notion of a "model bicategory" is clear: a complete, cocomplete bicategory where there are two "very weak" factorization systems, where the commutativity of the sq …
6
votes
What is a good basic reference on model categories?
Hovey's book seems exactly what you need. But take a look at http://folk.uio.no/paularne/SUPh05/DS.pdf which is nothing but a self-contained rewriting of Quillen's original work "Homotopical Algebra"; …
7
votes
3
answers
905
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A fibrant-objects structure on Top
(Sorry for the crossposting, but I'm really interested in this question).
One can define (Paragraph 1.5, page 10) a fibrant-object structure on a suitable cartesian closed category of topological spac …
1
vote
0
answers
431
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Homotopical Galois theory of coverings
In the hope this won't turn into a trivial problem (I couldn't find a similar discussion here), here's my question.
I'm studying a little homotopical algebra in this article by Brown. You can easily …