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2d
comment Banach-Mazur distance between the cube and the octahedron
If I understand well, you are especially interested in some situations where $Y$ is the dual of $X$.
2d
revised Banach-Mazur distance between the cube and the octahedron
deleted 3 characters in body
Apr
27
comment Pseudonyms of famous mathematicians
MathSciNet list AW as an author, though with only this paper, and does not identify him with INS.
Apr
26
awarded  Necromancer
Apr
23
comment Does weak convergence implies weak convergence of the positive part?
Of course. I just wrote too fast by saying "$f$ continuous". I meant "$f$ locally Lipschitzian".
Apr
22
comment Does weak convergence implies weak convergence of the positive part?
I see. Actually, if $p>\frac1n$ (so that $W^{1,p}(\Omega)$ is an algebra), your argument works even if we replace the positive part by every continuous function of $u$. Namely $u_r\rightharpoonup u$ implies $f(u_r)\rightharpoonup f(u)$. My error was that I wanted to use the fact, in a Hilbert space, that if in addition $\|u_r\|\rightarrow\|u\|$, then the convergence is strong. In $L^2$ this amounts to $u_r^2\rightharpoonup u^2$, but not in $H^1$ !!
Apr
22
revised Error estimate in the spectral theorem of compact operators on a Hilbert space
added 6 characters in body; edited title
Apr
21
revised Two questions on Elias Stein paper (1976)
added 25 characters in body; edited title
Apr
20
revised Proof of a fact about traces
added 543 characters in body
Apr
20
revised How to estimate a specific infinite matrix sum
deleted 69 characters in body
Apr
20
revised the pfaffian-adjugate and its counterparts for matrices odd size
added 3 characters in body
Apr
20
revised Complexity of solving systems of linear diophantine equations
edited title
Apr
20
awarded  linear-algebra
Apr
19
awarded  Enlightened
Apr
19
awarded  Nice Answer
Apr
19
revised Pfaffian equals complex determinant?
deleted 434 characters in body
Apr
19
revised Does the Pfaffian have a geometric meaning?
added 2 characters in body
Apr
19
revised Pfaffian equals complex determinant?
added 170 characters in body
Apr
19
revised Pfaffian equals complex determinant?
added 678 characters in body
Apr
19
revised Pfaffian equals complex determinant?
added 7 characters in body