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Oct 11, 2017 at 0:36 comment added Will Jagy Federico, if you use other stackexchange sites, you can edit those profiles to suit those sites. There should be a choice, at the point of saving your edits, of either exporting to all sites or just using the edits on that site. Meanwhile, on the matrix question, I asked about references here: math.stackexchange.com/questions/1388421/…
Oct 10, 2017 at 21:55 comment added Danra though, in the case of real symmetric matrices, the eigenvalues are also guarnateed to be real.
Oct 10, 2017 at 20:17 history answered Federico Poloni CC BY-SA 3.0