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Feb 23, 2021 at 19:36 comment added ComptonScattering @rannoudanames the question requires a matrix with two equal eigenvalues, David chose to set them both to zero.
May 11, 2019 at 14:39 comment added rannoudanames @DavidESpeyer Why do we look for trace and determinant to be 0?
Jun 14, 2018 at 22:24 comment added wonderich How about this quiz - generalizing autonne takagi factorization: mathoverflow.net/q/302741/27004
Dec 16, 2010 at 18:11 comment added Anirbit @David. Sorry for the first question. It was stupid of me. So any comments about the representation theory aspect of complex symmetric matrices as in comparison to real case which I was mentioning?
Dec 16, 2010 at 13:12 comment added David E Speyer In the sense that it is equal to its transpose. There are two off diagonal entries, and they are equal.
Dec 16, 2010 at 10:16 comment added Anirbit @David In what sense is the above matrix symmetric? (Definitely not in the sense of it being being equal to its transpose). Further one knows that $3\times 3$ symmetric traceless real matrices support an irreducible representation of $SO(3)$. Is there any analogous statement known for complex symmetric matrices or for the double cover $SU(2)$ or $SL(2,\mathbb{C})$ ?
May 5, 2010 at 21:47 vote accept Qfwfq
May 5, 2010 at 21:14 history answered David E Speyer CC BY-SA 2.5