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visits member for 2 years, 7 months
seen Jan 16 at 15:16

Sep
13
asked How to find a homeomorphism $\mathbb{R}^{n}\rightarrow\mathbb{R}^{n}$ having certain properties
Aug
30
asked Is there a cantor set in $\mathbb{R}^{n}-\{0\}$ which intersects every ray from the origin?
Aug
30
answered is $\{(x,y) : x,y \in \mathbb{Z} \}$ a closed set?
Aug
24
answered Partition of Unity in Spivak's Calculus on Manifolds
Aug
22
asked $n\times n$ matrix with zero determinant?
Aug
22
answered “Coordinate functions” on the structure-sheaf definition of a smooth manifold
Aug
20
asked Typo or additional hypotheses needed in problem 5, p.71 of Bredon's Topology and Geometry?
Aug
19
asked A functional structure on the graph of the absolute value function
Aug
8
answered Functionally structured spaces and manifolds
Aug
8
asked Functionally structured spaces and manifolds
Aug
2
asked Upper triangular matrices in $\mathrm{SL}(2,\mathbb{R})$
Aug
1
answered Quaternionic general linear group is open
Jul
29
asked Counterexample or proof that a certain subset in a topological group is closed
Jul
26
answered Closure of a certain subset in a compact topological group
Jul
25
asked Closure of a certain subset in a compact topological group
Nov
29
asked A gratifying re-encounter with a piece of math that was out of my mind
Nov
27
asked Problem 3-38 in Spivak´s Calculus on Manifolds
Nov
25
answered Do we need additional assumptions for problem 3-37 (b) in Spivak´s calculus on Manifolds?
Nov
25
asked Do we need additional assumptions for problem 3-37 (b) in Spivak´s calculus on Manifolds?
Nov
24
answered An application of partitions of unity: integrating over open sets.