List questions from 4-manifolds | MathQA

Need to calculate the 3D volume of a growing 4D hypersphere in Minkowski space

Published on 04 Nov 2021 - 3:51

Is there a relation between self-intersection and covering map?

Published on 10 Nov 2021 - 10:21

Intersection pairing of weighted projective plane

Published on 22 Nov 2021 - 4:05

Does $(S^1\times S^3)\#(S^1\times S^3)\#(S^2\times S^2)$ admit a symplectic form?

Published on 03 Mar 2022 - 22:03

If $n>1$, the square of the odd Fibonacci number $F(2n+1)$ can be written as the sum of exactly $F(2n+1)+1$ nonzero squares.

Published on 22 Mar 2022 - 10:57

Categories (other than TOP) to rule out exotic $\mathbb{R}^4$?

Published on 02 Apr 2022 - 15:37

Is Homeo(M) locally path-connected for a general topological manifold?

Published on 10 Apr 2022 - 23:48

Topological classification of complex surfaces

Published on 19 Apr 2022 - 15:50

Does the 3-manifold $S^1\times S^2$ bound a smooth integral homology ball?

Published on 24 Apr 2022 - 8:09

Action of the Gauge Group on the Configuration Space of Seiberg-Witten Theory

Published on 09 Jun 2022 - 18:12

Showing that a 4-manifold obtained by attaching a 2-handle is simply-connected

Published on 25 Mar 2026 - 13:55

Picturing twisting of strands explicitly after blow downs

Published on 25 Mar 2026 - 12:55