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  • 42 votes cast
Nov
16
awarded  Yearling
Nov
8
asked Correct term for trivial extension of linear operator on Hilbert spaces
Nov
2
comment Solid angle between vectors in n-dimensional space
Your second formula is quite awkward, because you apply arctan against a vector.
Oct
27
accepted Is the Empty set an orientable manifold?
Oct
27
asked Is the Empty set an orientable manifold?
Jul
28
awarded  Popular Question
Jul
19
revised Bound the pseudo-inverse matrix of a product
Typo
Jul
18
comment Proof by Induction $n^2+n$ is even
You know you don't need induction, do you?
Jul
18
asked Bound the pseudo-inverse matrix of a product
Jul
7
answered How to use Galerkin approximation to find the existence of weak solution.
Jul
6
accepted The Betti numbers of a triangulated ball relative to a disk in its boundary
Jul
6
revised The Betti numbers of a triangulated ball relative to a disk in its boundary
clarification
Jul
6
asked The Betti numbers of a triangulated ball relative to a disk in its boundary
Jun
20
asked Slobodeckij and Bessel definitions of fractional Sobolev spaces on Lipschitz domains
May
24
asked Example for $\Omega$ so that $\partial\Omega \neq \partial\bar{\Omega}$
Apr
30
accepted Cyclic containment of sets
Apr
22
awarded  Nice Question
Apr
7
comment Antisymmetric functions in higher dimensions
Okay, maybe a nice definition of signed permuation of coordinates is a permuation matrix times a ${-1,1}$-diagonal matrix, and the signum is the determinant of that transform.
Apr
7
comment Antisymmetric functions in higher dimensions
That's interesting. Your functions are smooth, are they? And could you please define what a signed permuation and its signum mean?
Apr
2
asked Cyclic containment of sets