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Apr
27
comment A problem with unitary matrices
Thank you @loupblanc.
Apr
27
accepted A problem with unitary matrices
Apr
23
revised A problem with unitary matrices
added note
Apr
23
comment A problem with unitary matrices
Are there any other matrices besides diagonal matrices? That's really my question.
Apr
23
asked A problem with unitary matrices
Sep
9
awarded  Popular Question
Sep
5
awarded  Enthusiast
Jul
23
revised general local to global principle
added question
Jul
23
revised general local to global principle
added stuff
Jul
23
comment general local to global principle
@HenningMakholm, in the case of the Birch Swinnerton-Dyer Conjecture, that would be the rank of the elliptic curve. But I left the word "structure" as a soft terminology. That's why I made this a soft question.
Jul
23
revised general local to global principle
correction
Jul
23
comment general local to global principle
@mvw, good catch. I made a correction.
Jul
23
comment general local to global principle
My question was inspired by the Birch Swinnerton-Dyer conjecture.
Jul
23
asked general local to global principle
Jul
15
accepted Graph Isomorphism algorithm that doesn't always work
Jul
14
comment Graph Isomorphism algorithm that doesn't always work
I've gotten good answers here before.
Jul
14
comment Graph Isomorphism algorithm that doesn't always work
I added my answer as an edit and deleted my answer.
Jul
14
revised Graph Isomorphism algorithm that doesn't always work
added stuff
Jul
14
comment Graph Isomorphism algorithm that doesn't always work
But even when the eigenvalues are not all distinct and $V$ is not a permutation matrix, isn't it possible to turn $V$ into a permutation matrix when the graphs are isomorphic?
Jul
14
comment Graph Isomorphism algorithm that doesn't always work
The problem is when the eigenvalues are not all distinct. Then it is possible that $V$ is not a permutation matrix, even if the graphs are isomorphic.