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  • 0 posts edited
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  • 123 votes cast
Mar
3
comment Is such a function integrable?
Many thanks for help.
Mar
3
comment Is such a function integrable?
But since $f$ is $2\pi$-periodic, $f(x_0+\pi)=f(x_0-\pi)$.
Mar
3
comment Is such a function integrable?
I forget. $f$ should be differentiable at $x_0$. I just have edited.
Mar
3
asked Is such a function integrable?
Feb
22
asked Is such reversed Young's inequality true?
Feb
21
awarded  Yearling
Dec
29
accepted A problem with equivalence of two definitions of essential supremum of a function
Dec
29
asked A problem with equivalence of two definitions of essential supremum of a function
Dec
21
awarded  Constituent
Dec
15
accepted A problem with equality in a inequality for convex function
Dec
15
awarded  Caucus
Dec
15
revised A problem with equality in a inequality for convex function
added 7 characters in body
Dec
15
comment A problem with equality in a inequality for convex function
Yes. I will correct my answer.
Dec
15
asked A problem with equality in a inequality for convex function
Dec
12
accepted A problem with showing that some subspace is a hyperplane
Dec
12
asked A problem with showing that some subspace is a hyperplane
Dec
6
awarded  Popular Question
Oct
12
accepted Problem with a proof of theorem about diagonalization for selfadjoint operators
Oct
11
comment Problem with a proof of theorem about diagonalization for selfadjoint operators
But you used the spectral theorem. I try to proved this theorem in another way, using the idea of P. Halmos, Finite dimensional vector spaces, par.79, thr.1.
Oct
11
asked Problem with a proof of theorem about diagonalization for selfadjoint operators