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user1936752
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6 votes
2 answers
2k views

How can we prove that a Fourier Series exists?

6 votes
1 answer
242 views

Inequality of difference of entropy

6 votes
1 answer
1k views

Adjoint of a nonlinear operator?

5 votes
1 answer
928 views

KL divergence, Fisher information and "distance" in information theory

5 votes
0 answers
417 views

Partial trace and preserving positive semidefiniteness

5 votes
2 answers
31k views

Repeated eigenvalues: How to check if eigenvectors are linearly independent or not?

5 votes
2 answers
197 views

How to solve this DE?

5 votes
2 answers
560 views

Prove that the cross product of two vectors is a vector

5 votes
1 answer
616 views

Trouble understanding Weyl's unitary trick

5 votes
3 answers
229 views

Three player combinatorial game - minimizing communication between Alice and Bob

4 votes
1 answer
2k views

Random Gaussian variable raised to arbitrary power

4 votes
1 answer
253 views

Closest matrix that achieves positive semidefinite condition

4 votes
2 answers
141 views

How do we know that group representations exist?

3 votes
2 answers
184 views

For a projection $\Pi$, is $\text{tr}(\Pi X)\leq \text{tr}(X)$?

3 votes
0 answers
323 views

Derivative of Tr$(\rho\log\rho)$

3 votes
1 answer
209 views

Proof of a variational trace inequality

3 votes
2 answers
5k views

Gaussian distribution raised to a power

3 votes
2 answers
2k views

Lagrange multiplier problem - Why doesn't the method work?

3 votes
1 answer
266 views

Discrete Fourier Transform question

3 votes
1 answer
826 views

Direct sum in physics

3 votes
1 answer
149 views

Geometric center of convex set of positive semidefinite matrices

3 votes
1 answer
53 views

Claim of convexity of unitaries with $\|U\|_\infty \leq 1$ for a minimax theorem

3 votes
0 answers
37 views

Discarding small eigenvalues to bound rank of a matrix

3 votes
1 answer
93 views

Positive semidefinite ordering of matrices after small perturbations

3 votes
1 answer
224 views

Positive semidefinite matrix ordering and nuclear norm of products

2 votes
1 answer
132 views

If $A\approx_\varepsilon D$, where $D$ is diagonal, is $A$ already almost diagonal?

2 votes
0 answers
91 views

How to simplify this linear program using symmetries?

2 votes
2 answers
102 views

How to numerically evaluate large binomial coeffcient terms?

2 votes
1 answer
36 views

Decomposing the all $1$s matrix in tensor products

2 votes
0 answers
25 views

Terminology: Partition of matrix

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