Spice the Bird
  • Member for 10 years, 9 months
2 answers
19 votes
1k views
9 bookmarks
If $X$ is a simplicial complex, is there a characterization of the links of its vertices that is equivalent to the statement "$|X|$ is a manifold"?
2 answers
13 votes
1k views
3 bookmarks
What is the homotopy type of the space of the homeomorphisms of the n-ball such that the homeomorphism restricted to the boundary is isotopic to the identity?
5 answers
13 votes
1k views
5 bookmarks
Is the following invariant of rooted trees a complete invariant?
1 answers
11 votes
448 views
4 bookmarks
What is the precise relationship between "prodsimplicial sets" and rooted trees?
4 answers
6 votes
1k views
4 bookmarks
What is the intuition of connections for cubical sets?
2 answers
5 votes
639 views
2 bookmarks
A subcategory of top where subspaces and subobjects coincide?
0 answers
5 votes
158 views
What propositions about sets can be transfered to propositions about a presheaf category?
2 answers
4 votes
363 views
2 bookmarks
Is it possible to define the notion of a localization of a category without reference to a set of morphisms, $S$?
1 answers
3 votes
320 views
1 bookmarks
Does each "prod-simplicial" regular cell complex come from a unique rooted tree?
1 answers
3 votes
488 views
1 bookmarks
What is the chromatic number of the graph whose vertices dimension $n-2$ subsimplicies of $\Delta^n$ and an edge between two vertices is given if the two associated $n-2$ vertices are contained in the same $n-1$ subsimplex?
3 answers
3 votes
373 views
1 bookmarks
Are the categories, $\widehat{\mathcal{A}}\downarrow X$ and $\widehat{\mathcal{A}\downarrow X}$ equivalent.