Skip to main content
Search type Search syntax
Tags [tag]
Exact "words here"
Author user:1234
user:me (yours)
Score score:3 (3+)
score:0 (none)
Answers answers:3 (3+)
answers:0 (none)
isaccepted:yes
hasaccepted:no
inquestion:1234
Views views:250
Code code:"if (foo != bar)"
Sections title:apples
body:"apples oranges"
URL url:"*.example.com"
Saves in:saves
Status closed:yes
duplicate:no
migrated:no
wiki:no
Types is:question
is:answer
Exclude -[tag]
-apples
For more details on advanced search visit our help page
Results tagged with
Search options not deleted user 102

Homotopy theory, homological algebra, algebraic treatments of manifolds.

4 votes

How to show that a space has the homotopy type of wedge of spheres ?

(If I remember correctly) a shellable (simplicial) complex automatically has the homotopy type of a wedge of spheres: if you could find a shellable triangulation you should be done. Of course, this'l …
Mikael Vejdemo-Johansson's user avatar
14 votes
2 answers
2k views

Sheaves over simplicial sets

Is there a good way to define a sheaf over a simplicial set - i.e. as a functor from the diagram of the simplicial set to wherever the sheaf takes its values - in a way that while defined on simplex b …
Mikael Vejdemo-Johansson's user avatar
2 votes
0 answers
233 views

Cohomology spectral sequence over $k[t]$

I am trying to compute $H^*(X)$ for a (potentially large, finite, finitely filtered) simplicial complex $X$ using a cover $U_i$ of $X$. I am building chain complexes for $X$ with a simplex that appea …
Mikael Vejdemo-Johansson's user avatar
5 votes
0 answers
503 views

Is the face poset a Heyting algebra?

Is the face poset of a simplicial or nice enough cellular complex a Heyting algebra in some natural way? Edited to add: For the benefit of illustration, here's a few face posets: the boundary of a …
Mikael Vejdemo-Johansson's user avatar
9 votes
2 answers
924 views

Intuitionistic algebraic topology?

Are there results in algebraic topology -- preferably relating to homology or homotopy or phraseable in simplicial sets -- that are not true in an intuitionistic logic? In other words, are there res …
Mikael Vejdemo-Johansson's user avatar
5 votes

The relationship between low dimensional topology and dynamics

Robert Ghrist started out his (prolific) research career investigating knotted trajectories in dynamical systems. http://www.math.upenn.edu/~ghrist/preprints-dynamics.html Konstantin Mischaikow has b …
Mikael Vejdemo-Johansson's user avatar
11 votes

Computer-aided homology computations

There are several applications and libraries out there that deal with homology computations with various approaches to the computation. One field with a strong focus on efficient computation of homolo …
Mikael Vejdemo-Johansson's user avatar
16 votes

"Homotopy-first" courses in algebraic topology

There is the Aguilar-Gitler-Prieto book on algebraic topology: Algebraic Topology from a Homotopical Viewpoint. As I recall from browsing it, the book is meant to be a graduate course in algebraic top …
5 votes

When are (finite) simplicial complexes (smooth) manifolds?

There is the idea of a simplicial manifold, which works by checking that the complex is pure (all facets of the same dimension) and that each codimension 1 face is included in the correct number of fa …
Mikael Vejdemo-Johansson's user avatar
2 votes

Are there some original papers or books related to applications of algebraic topology and al...

Another good place to start is to track the output of Marion Mrozek and Konstantin Mischaikow, and their various co-authors. There is a whole group at the University in Krakow centered on Mrozek doing …
3 votes

Are there some original papers or books related to applications of algebraic topology and al...

One place where papers on applications of algebraic topology — to dynamical systems as well as to statistics, data analysis, bio-medicine, computational geometry and other areas — gets aggregated is o …
8 votes

Persistent homology of Gaussian fields in Euclidean space

The closest I can find spontaneously would be Matthew Kahle's work on random topology; http://arxiv.org/abs/0910.1649 looks like it would be directly related to your question, and http://arxiv.org/abs …
Mikael Vejdemo-Johansson's user avatar
-2 votes

The second homotopy group of a simple CW-complex

So, the one 0-cell forces the 1-skeleton to be a figure-8. And we attach three 2-cells to this figure-8. These cells can be attached to: loop 1, with some winding number n. loop 2, with some winding …
Mikael Vejdemo-Johansson's user avatar