jjcale's user avatar
jjcale's user avatar
jjcale's user avatar
jjcale
  • Member for 12 years, 7 months
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18 votes

Is the linear span of special orthogonal matrices equal to the whole space of $N\times N$ matrices?

14 votes

Examples of theorems with proofs that have dramatically improved over time

14 votes

What is a good method to find random points on the n-sphere when n is large?

13 votes

Does Physics need non-analytic smooth functions?

8 votes

Projections in Banach spaces

7 votes

What are the possible eigenvalues of these matrices?

7 votes
Accepted

Well known matrix inequality?

6 votes

How to prove this determinant is positive?

6 votes

Open problems in PDEs, dynamical systems, mathematical physics

6 votes
Accepted

Perturbations of an operator that disconnect the spectrum

5 votes
Accepted

On the Paley-Wiener theorem

5 votes
Accepted

on an inequality of Brezis-Lieb

5 votes
Accepted

How to prove this determinant is positive-II?

4 votes
Accepted

What are the possible eigenvalues of these matrices?

4 votes

Inequality with symmetric polynomials

4 votes
Accepted

A singular value-eigenvalue inequality

3 votes
Accepted

Is $k(A, B) = \text{Tr}[(A^{1/2} B A^{1/2})^{1/2}]$ a positive definite kernel?

3 votes

Vacuum vector and basis defined by anti-commuting operators

3 votes
Accepted

A simple but curious determinantal inequality

3 votes

Computation of a minimal polynomial

3 votes

Computation of a minimal polynomial

3 votes
Accepted

An Optimization Problem with Complex Variables, regarding Eigenvalues of Circulant Matrices

3 votes
Accepted

A generalized log inequality for positive definite trace-one matrices

3 votes

Does there exist a continuous function of compact support with Fourier transform outside L^1?

2 votes

Quasinilpotent example

2 votes
Accepted

quasinilpotence and finite spectrum

2 votes

Most helpful math resources on the web

2 votes

Bounding a spectral gap: what proof techniques exist?

2 votes

Can there be a polymath project for mathematical physics?

2 votes

How to solve such an optimization problem