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Apr
16
asked Textbooks on modern optimization (on machine learning) with exercises
Feb
5
comment The positive-definite-ness of RBF kernel
@user1551 As I mentioned, I am calculating $\log\det$. Simply calling $\det$ will produce zero, while summing up the logarithm of eigenvalues is OK for large $\alpha$ since no eigenvalue will be calculated as negative.
Feb
5
revised The positive-definite-ness of RBF kernel
added 41 characters in body
Feb
2
comment The positive-definite-ness of RBF kernel
@user1551 Then how to calculate it? RBF kernel is quite common I think there should be some robust algorithms.
Feb
1
asked The positive-definite-ness of RBF kernel
Jan
7
awarded  Popular Question
Oct
25
awarded  Announcer
Oct
21
asked Questions about algebraic manifold on matrices
Oct
7
revised How can I get sequence $4,4,2,4,4,2,4,4,2\ldots$ into equation?
TeXification
Oct
7
awarded  Custodian
Oct
7
reviewed Reviewed How can I get sequence $4,4,2,4,4,2,4,4,2\ldots$ into equation?
Oct
7
suggested approved edit on How can I get sequence $4,4,2,4,4,2,4,4,2\ldots$ into equation?
Oct
6
revised Given a volumen. Which is the suface, that contains it, that has minimal area?
\int x3 -> \iiint
Oct
6
suggested approved edit on Given a volumen. Which is the suface, that contains it, that has minimal area?
Oct
6
comment Big Rudin Exercise 3.26 - Which integral is larger
Can you prove the case of simple function first?
Oct
5
revised Change of variables problem
\int x3 -> \iiint
Oct
5
suggested approved edit on Change of variables problem
Oct
5
comment Vector Spaces and AC
en.wikipedia.org/wiki/… says "In all models of ZF¬C there is a vector space with no basis."
Oct
4
comment How to find the numbers that sum up to a given number?
Hope en.wikipedia.org/wiki/Subset_sum_problem can help.
Oct
1
comment Is the limit of non-decreasing sequence that is bounded equal to the upper bound?
$M$ can be of course larger than $L$. Think about $a_n=1-1/n$ and $M=2$