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earned this badge 19 times.
Eigenvalues of generalized Vandermonde matrices
Awarded Mar 12 at 23:25
What is the "positive part" of the unit ball in $M_n(R)$ ?
Awarded Jan 25, 2021 at 11:11
0 eigenvalue for a symmetric tridiagonal matrix
Awarded Jan 25, 2021 at 11:11
A generalization of van der Waerden's conjecture
Awarded Oct 11, 2019 at 11:10
A spectral inequality for positive-definite matrices
Awarded May 13, 2019 at 21:55
On the positive definiteness of a linear combination of matrices
Awarded Feb 15, 2018 at 15:11
Trace of non-commutable matrices
Awarded Nov 8, 2017 at 12:17
Wanted: Positivity certificate for the AM-GM inequality in low dimension
Awarded Aug 31, 2017 at 6:26
Solving $\text{trace}\left[\left(I + pY\right)^{-1} \left(I - p^{2}Y\right)\right] = 0$ for scalar $p$
Awarded Jun 23, 2017 at 8:54
Concavity of the trace of a matrix power
Awarded Jun 12, 2017 at 13:31
Efficient rank-two updates of an eigenvalue decomposition (or more generally SVD)
Awarded Nov 7, 2016 at 0:42
Hlawka inequality for determinants of positive definite matrices
Awarded Nov 2, 2015 at 11:58
A maximal element, where Schur gives a minimal element
Awarded Oct 12, 2015 at 23:35
Are the following identities well known?
Awarded Oct 12, 2015 at 9:47
A possible extension of a determinant inequality
Awarded Jun 27, 2015 at 18:08
Anti-bidiagonal matrix with main anti-diagonal {1,2,3,...} and first sub-anti-diagonal {-1,-2,-3,...} has eigenvalues lambda={1,-2,3,-4,...}
Awarded Nov 29, 2014 at 22:05
Absolute value inequality for complex numbers
Awarded May 21, 2014 at 12:30
Arithmetic-geometric mean of positive matrices
Awarded Mar 30, 2013 at 21:35
Eigenvalues of the product of two symmetric matrices
Awarded Aug 25, 2011 at 0:20

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