User Nathaniel Johnston

51 votes

2 answers

5k views

A strengthening of the Cauchy-Schwarz inequality

asked Jun 2, 2018 at 17:26

35 votes

0 answers

949 views

Orthogonal vectors with entries from $\{-1,0,1\}$

asked May 17, 2023 at 19:10

7 votes

1 answer

252 views

Existence of a linear map resulting in the determinant being an elementary symmetric polynomial

asked Jun 17 at 12:44

5 votes

1 answer

429 views

Waring rank of monomials, and how it depends on the ground field

asked Nov 19, 2022 at 14:45

5 votes

1 answer

246 views

Dimension reduction for non-negativity of elementary symmetric polynomials

asked Mar 1, 2022 at 17:02

5 votes

0 answers

145 views

Groups of operators between local unitaries and full unitaries

asked Feb 24, 2014 at 19:02

4 votes

0 answers

105 views

Characterization of "PSD-Squared" Matrices

asked May 24, 2020 at 23:59

3 votes

0 answers

224 views

Schur-Horn theorem for principal submatrices

asked Feb 1, 2022 at 0:39

3 votes

0 answers

358 views

Do Isometry Groups Tell Us How Difficult Norms are to Compute?

asked Dec 1, 2010 at 22:44

3 votes

1 answer

290 views

Smallest number of subsets whose squares cover the whole square

asked Jan 10 at 0:35

2 votes

1 answer

436 views

Maximum permuted row/column sum of a matrix

asked Jun 7, 2022 at 21:53

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11 Questions

A strengthening of the Cauchy-Schwarz inequality

Orthogonal vectors with entries from $\{-1,0,1\}$

Existence of a linear map resulting in the determinant being an elementary symmetric polynomial

Waring rank of monomials, and how it depends on the ground field

Dimension reduction for non-negativity of elementary symmetric polynomials

Groups of operators between local unitaries and full unitaries

Characterization of "PSD-Squared" Matrices

Schur-Horn theorem for principal submatrices

Do Isometry Groups Tell Us How Difficult Norms are to Compute?

Smallest number of subsets whose squares cover the whole square

Maximum permuted row/column sum of a matrix