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daw
  • Member for 12 years, 3 months
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31
Is every Hilbert space separable?
Sep 28, 2017
28
Inner product on $C(\mathbb R)$
May 30, 2014
21
Is KKT conditions necessary and sufficient for any convex problems?
Nov 10, 2017
21
Orthogonal Projection of $ z $ onto the Affine set $ \left\{ x \mid A x = b \right\} $
Jun 10, 2015
15
Ensuring that a symmetric matrix with nonnegative elements is positive semidefinite
May 7, 2015
13
How to show that $A^2=AB+BA$ implies $\det(AB-BA)=0$ for $3\times3$ matrices?
Jan 26, 2015
13
Proof of Linear independence of generalized eigenvectors without applying generalized eigenspace decomposition.
Nov 27, 2014
13
Spectrum of Multiplication Operator $T$ in $C[0,1]$
Nov 24, 2014
12
Union of closed convex sets
May 17, 2021
12
Using the Bolzano's theorem to prove that exists only one solution in the interval.
Jun 16, 2014

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OLD Requests for Reopen & Undeletion Votes (volume 01/2021 - 12/2021)

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24
Mishustin's circle problem
20
Prime number snake (2)
18
Knights attacking exactly three knights
18
Knights and knaves not on an island
16
What is the symbol on the face opposite ● (solid black circle)?