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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
0 answers
56 views

Reedy cofibration category structure

Is there a notion of Reedy cofibration category written down somewhere ? I don't want to reinvent the wheel. Motivation: I ask the question because I have a cofibration category in the sense of http …
Philippe Gaucher's user avatar
5 votes
1 answer
154 views

Category of elements and Quillen adjunction

Consider the category of elements construction described in https://ncatlab.org/nlab/show/category+of+elements. It induces a left adjoint from $[\mathcal{C},\mathrm{Set}]$ (the category of functors fr …
Philippe Gaucher's user avatar
3 votes
0 answers
83 views

Are fibrations of small categories fibrations?

The isofibrations are the fibrations of the canonical model structure of the category of small categories. If I call fibration of small categories the same notion by removing the word isomorphism, i.e …
Philippe Gaucher's user avatar
2 votes
0 answers
133 views

Tensor product of objectwise weak homotopy equivalences of $\mathcal{M}$-spaces

I consider the enriched category $[\mathcal{M}^{op},\mathrm{Top}]$ of enriched functors (I call them $\mathcal{M}$-spaces) from the enriched small category $\mathcal{M}^{op}$ to the enriched category …
Philippe Gaucher's user avatar
2 votes
0 answers
95 views

Projective model categories on homotopy equivalent index categories

Consider a fixed proper simplicial combinatorial model category $\mathcal{M}$. Consider a functor $F:I\to J$ between small categories. It induces a right Quillen functor $F^*:\mathcal{M}^J \to \mathca …
Philippe Gaucher's user avatar
3 votes
0 answers
100 views

Homotopy theory for small strict semimonoidal topologically enriched categories

I work with the category of $\Delta$-generated spaces. I call reparametrization category a small strict semimonoidal topologically enriched category $(\mathcal{P},\otimes)$ such that $\mathcal{P}(\ell …
Philippe Gaucher's user avatar
1 vote
0 answers
49 views

Cellular model of a locally presentable category

According to https://ncatlab.org/nlab/show/cellular+model, I call a cellular model of a locally presentable category a set of monomorphisms cofibrantly generating the monomorphisms. I am curious to se …
Philippe Gaucher's user avatar
3 votes
0 answers
98 views

About homotopy weighted colimit

Let $X:I\to M$ be a functor from a small category $I$ to a simplicial accessible (not combinatorial) proper model category $M$ which is already injective cofibrant. Let $W:I^{op}\to \mathrm{Set}$ be a …
Philippe Gaucher's user avatar
1 vote
1 answer
136 views

Unit of a Quillen equivalence and fibration

Let $L:\mathcal{M}\leftrightarrows\mathcal{N}:R$ be a Quillen equivalence between combinatorial model categories such that all objects are fibrant. Let $X$ be a cofibrant object of $\mathcal{M}$. Then …
Philippe Gaucher's user avatar
5 votes
1 answer
173 views

Fibrant replacement of an injective model category of enriched diagrams

Take a topologically enriched small category $\mathcal{P}$ and the category of enriched diagrams of spaces $[\mathcal{P},\mathrm{Top}]_0$. We work with the category of $\Delta$-generated spaces equipp …
Philippe Gaucher's user avatar
2 votes
0 answers
142 views

When this coend is invariant up to homotopy?

It is a follow-up of my question Calculation of the homotopy colimit of a diagram of spaces which was badly formulated. Consider a fixed diagram $D:I^{op}\to {\rm Top}$ where ${\rm Top}$ is a conveni …
Philippe Gaucher's user avatar
3 votes
0 answers
167 views

Calculation of the homotopy colimit of a diagram of spaces

Consider a small category $I$. There exists a small diagram $D:I^{op}\to {\rm Top}$ where ${\rm Top}$ is a convenient category for doing algebraic topology such that for all small diagrams $X:I\to {\r …
Philippe Gaucher's user avatar
6 votes
1 answer
292 views

About the dual of the cube lemma in homotopy theory

Consider the Reedy category $2\rightarrow 1 \leftarrow 0$. Consider a map of diagrams of topological spaces $D\to E$ over this Reedy category: The maps which are fibrations are depicted with the symb …
Philippe Gaucher's user avatar
1 vote
0 answers
153 views

Constructing a model structure without knowing the class of weak equivalences

I need to prove the existence of a model structure but I am still unable to formulate a definition of the class of weak equivalences. I have the following informations: The underlying category is loc …
Philippe Gaucher's user avatar
4 votes
1 answer
180 views

Almost combinatorial accessible model categories

Theorem: Assume VP. Let $\mathcal{M}$ be an accessible model category such that there exists a set of generating cofibrations $I$ and such that all objects are fibrant. Then it is combinatorial. Pro …
Philippe Gaucher's user avatar

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