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Part of higher category theory that for instance in Algebraic Topology enables us to capture finer homotopic distinctions. As in say Eilenberg-Maclane spaces.
14
votes
Accepted
Quasicategories for non-simplicial model categories
It's not quite in the literature, but there is a fully explicit construction that avoids hammock localisation or any kind of fibrant replacement: by a recent result of Lennart Meier, a certain "double …
8
votes
Accepted
Reedy fibrancy and composition in Segal spaces
Given a simplicial object $X$ in a locally small category $\mathcal{M}$ and a simplicial set $S$, define the weighted limit $\{ S, X \}$ to be an object in $\mathcal{M}$ equipped with an isomorphism
$ …
4
votes
Decomposing a (co)limit by decomposing the indexing diagram
I assume $\varinjlim_{j : \mathcal{J}} \mathcal{I}_j = \mathcal{I}$ is meant in the strict sense of 1-categories. Since $\textbf{Cat}$ is cartesian closed,
$$\textstyle [\mathcal{I}, \mathcal{C}] \con …
8
votes
Accepted
Difference between coherent nerve of simplical model category and simplicial category
We can detect the difference between the two constructions using the homotopy category. Given any simplicially enriched category $\mathcal{C}$, we can construct an ordinary category $\pi_0 [\mathcal{C …
17
votes
1
answer
1k
views
The category theory of $(\infty, 1)$-categories
There are many proposed models for the theory of $(\infty, 1)$-categories and it has now been shown that many of these theories have Quillen-equivalent model categories, i.e. that they are equivalent …