Dan Rust's user avatar
Dan Rust's user avatar
Dan Rust's user avatar
Dan Rust
  • Member for 11 years, 5 months
  • Last seen this week
158 votes
3 answers
19k views

Slice of pizza with no crust

99 votes
2 answers
2k views

Geometric way to view the truncated braid groups?

37 votes
2 answers
2k views

Homeomorphic to the disk implies existence of fixed point common to all isometries?

28 votes
1 answer
8k views

Does taking the direct limit of chain complexes commute with taking homology?

28 votes
1 answer
2k views

Examples of falsified (or currently open) longstanding conjectures leading to large bodies of incorrect results.

13 votes
2 answers
5k views

Equivalences and isomorphisms of short exact sequences

13 votes
1 answer
759 views

Can the n-string sphere braid group embed in to the (n+1)-string sphere braid group?

13 votes
1 answer
572 views

Applications of TQFTs beyond physics

6 votes
2 answers
507 views

Properties of the Category of topological spaces with $n$ basepoints.

5 votes
3 answers
1k views

Showing that the loopspace $\Omega S^{\infty}$ is homotopic to $S^{\infty}$.

5 votes
1 answer
181 views

Higher dimensional analogue of the correspondence between $2$d TQFTs and Frobenius algebras?

5 votes
0 answers
408 views

Cohomology of the pullback of a fiber bundle over the torus (generalised Eilenberg-Moore spectral sequence?)

5 votes
1 answer
242 views

Applying Khovanov homology to two different non-trivial diagrams of the unknot

4 votes
0 answers
81 views

Finite strings of integers from $\{1,1,2,2,\ldots,n,n\}$ such that there are $k$ elements between the two $k$s

4 votes
1 answer
219 views

Definition of the higher dimensional mapping tori

4 votes
0 answers
380 views

Intuition behind a proof showing a square is homeomorphic to a quotient of an interval

3 votes
1 answer
450 views

Repetitive tiling implies finite local complexity

3 votes
1 answer
228 views

Sufficient condition for a direct limit of abelian groups to be infinitely generated

3 votes
1 answer
759 views

How to test if a primitive matrix has an eigenvalue of unit modulus

3 votes
1 answer
186 views

If direct limits of matrices are isomorphic, is the direct limit of the transpose matrices also isomorphic?

3 votes
1 answer
134 views

Must every infinite subshift contain a non-periodic point?

3 votes
1 answer
250 views

When is the space of connected components Hausdorff?

2 votes
1 answer
198 views

Is the inverse limit of simplicial maps between finite directed graphs also a graph?

2 votes
1 answer
76 views

Exchanging limits when functions may not converge uniformly

2 votes
2 answers
239 views

Hyperbolic quadrilaterals with two adjacent right angles

2 votes
4 answers
592 views

Method for finding eigenplanes of a linear transformation.

0 votes
1 answer
74 views

Labeling edges of a cube with + and - so each face has an odd number of +s.