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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.

5 votes

Construction of combinatorial model categories with all objects fibrant

Nikolaus has shown (see Cor 2.21) that every combinatorial model category where all trivial cofibrations are monic is Quillen equivalent to its category of algebraically-fibrant objects, in which ever …
Tim Campion's user avatar
6 votes
Accepted

About a canonical model structure on topologically enriched categories

Yes, the canonical model structure is unique. The uniqueness of the canonical model structure on $Cat$ was nicely exposited by Chris Schommer-Pries on the Secret Blogging Seminar back in the day. Let' …
Tim Campion's user avatar
5 votes
Accepted

A question about combinatorial model categories

Lurie uses A.2.6.7 to prove the "easy" direction of Jeff Smith's theorem in A.2.6.8, namely that every combinatorial model category arises from the construction of the theorem. This part of the theore …
Tim Campion's user avatar
6 votes

Transporting a model category structure along a left adjoint

My go-to reference for inducing model structures along an adjunction is Hess, Kedziorek, Riehl, and Shipley's A necessary and sufficient condition for induced model structures, which works in great ge …
Tim Campion's user avatar
2 votes

Euclidean model structure on multipointed $d$-spaces

Note that category you've described is not locally presentable, but this is not a big deal -- if you use Delta-generated spaces (or some variant thereof) instead of general topological spaces, you're …
Tim Campion's user avatar
4 votes
Accepted

Simplicial models for fibrations between mapping spaces

Yes, these agree. The usual model structures on $C = sSet$ and on $C = Top$ are both cartesian monoidal. So the functor $[-,X] : C^{op} \to C$ is a right Quillen functor when $X$ is fibrant (where $[ …
Tim Campion's user avatar
1 vote

When is a right lifting property closed under pushouts?

TL;DR : I'm not sure! (In the following, I basically elide the difference between (weak) factorization systems and classes of morphisms defined by (weak) lifting properties, which is often harmless, e …
Tim Campion's user avatar
7 votes

When a model category with prescribed homotopy category exists?

Let me see if I understand the question. If you start with one of the following pieces of data: a model category a relative category an $(\infty,1)$-category you can extract a homotopy category plus …
Tim Campion's user avatar
6 votes

What are surprising examples of Model Categories?

There is Krause and Nikolaus' model structure on the category of group presentations whose homotopy category is the category of groups.
Tim Campion's user avatar
5 votes
Accepted

Simplicial Enrichment of Joyal-Tierney Model Structure on $Cat$

I asked Chris Schommer-Pries (the author of the blog post) about this. It's discussed in an unpublished note by Charles Rezk (either scroll down here to the note "A model category for categories", or …
Tim Campion's user avatar
6 votes

Trees in chain complexes

Let $T$ be a well-founded poset and $k$ a field. Let $H: Ch_k \to Ho(Ch_k) = Gr_k$ be the homology functor and $\iota: Gr_k \to Ch_k$ be the canonical section which sends a graded vector space to the …
Tim Campion's user avatar
4 votes

Combinatorial proof that some model categories are monoidal/enriched?

I'll do you one better: you don't need a generating set of acyclic cofibrations. You just need what Simpson calls a pseudo-generating set, i.e. a set of acyclic cofibrations which suffices to detect f …
Tim Campion's user avatar
6 votes

Model categories with uniqueness

If your goal is to understand how lifting properties in algebraic geometry fit into the bigger picture, I think the thing to say is that lifting properties are widely used in category theory for all s …
Tim Campion's user avatar
1 vote

Lax monoidal fibrant replacement for marked simplicial sets

Not a complete answer. The following is inspired by Dmitri Pavlov's answer here. Let's recall the work of Dugger and Spivak. Let $\mathcal G$ be a "category of gadgets closed under wedges" (Definition …
Tim Campion's user avatar
7 votes

What are the fibrant objects in the injective model structure?

In the years since this question was first asked, a new characterization of the fibrant objects in the injective model structure has been given by Mike Shulman in All (∞,1)-toposes have strict univale …
Tim Campion's user avatar

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