shuhalo
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 Nov16 awarded Yearling Nov8 asked Correct term for trivial extension of linear operator on Hilbert spaces Nov2 comment Solid angle between vectors in n-dimensional space Your second formula is quite awkward, because you apply arctan against a vector. Oct27 accepted Is the Empty set an orientable manifold? Oct27 asked Is the Empty set an orientable manifold? Jul28 awarded Popular Question Jul19 revised Bound the pseudo-inverse matrix of a product Typo Jul18 comment Proof by Induction $n^2+n$ is even You know you don't need induction, do you? Jul18 asked Bound the pseudo-inverse matrix of a product Jul7 answered How to use Galerkin approximation to find the existence of weak solution. Jul6 accepted The Betti numbers of a triangulated ball relative to a disk in its boundary Jul6 revised The Betti numbers of a triangulated ball relative to a disk in its boundary clarification Jul6 asked The Betti numbers of a triangulated ball relative to a disk in its boundary Jun20 asked Slobodeckij and Bessel definitions of fractional Sobolev spaces on Lipschitz domains May24 asked Example for $\Omega$ so that $\partial\Omega \neq \partial\bar{\Omega}$ Apr30 accepted Cyclic containment of sets Apr22 awarded Nice Question Apr7 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. Apr7 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? Apr2 asked Cyclic containment of sets