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daw
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View all questions and answers
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29
Is every Hilbert space separable?
Sep 28, 2017
question
27
Inner product on $C(\mathbb R)$
May 30, 2014
answer
21
Orthogonal Projection of $ z $ onto the Affine set $ \left\{ x \mid A x = b \right\} $
Jun 10, 2015
answer
20
Is KKT conditions necessary and sufficient for any convex problems?
Nov 10, 2017
answer
15
Ensuring that a symmetric matrix with nonnegative elements is positive semidefinite
May 7, 2015
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13
How to show that $A^2=AB+BA$ implies $\det(AB-BA)=0$ for $3\times3$ matrices?
Jan 26, 2015
answer
12
Using the Bolzano's theorem to prove that exists only one solution in the interval.
Jun 16, 2014
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12
Union of closed convex sets
May 17, 2021
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12
Eigenvectors and eigenvalues from $X^TX$ to $XX^T$?
Apr 23, 2015
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12
Proof of Linear independence of generalized eigenvectors without applying generalized eigenspace decomposition.
Nov 27, 2014
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Mishustin's circle problem
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Prime number snake (2)
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Knights and knaves not on an island
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Knights attacking exactly three knights
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The Twelve Apostles