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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 …
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 …
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 …
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 …
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 …
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 …
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 …
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 …
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 …
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 …
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 …
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 …
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 …
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 …
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 …