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Apr 13, 2017 at 12:58 history edited CommunityBot
replaced http://mathoverflow.net/ with https://mathoverflow.net/
Apr 13, 2017 at 12:19 history edited CommunityBot
replaced http://math.stackexchange.com/ with https://math.stackexchange.com/
May 30, 2013 at 19:03 comment added J. M. isn't a mathematician As you have linked to the paper by Taussky and Todd, you might want to mention www-math.mit.edu/~edelman/homepage/papers/kac.pdf as well...
May 30, 2013 at 18:33 history edited Dietrich Burde CC BY-SA 3.0
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May 30, 2013 at 11:58 comment added Dietrich Burde @Darij: you are right, the proof is not evident. My answer was (is) a comment about the mistake of the matrix, not more. @Gerry: I have found your link and the answers, thank you. The correction to the problem got lost, as we see.
May 30, 2013 at 11:46 history edited Dietrich Burde CC BY-SA 3.0
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May 29, 2013 at 23:47 comment added Gerry Myerson Yes, OP posted to m.se, I posted a $3\times3$ counterexample, then the correction to the problem was noted, and a link was given to a previous m.se question about the same matrix.
May 29, 2013 at 20:46 comment added darij grinberg Why easily? Where is the symmetry?
May 29, 2013 at 19:58 history edited Dietrich Burde CC BY-SA 3.0
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May 29, 2013 at 19:34 history edited Dietrich Burde CC BY-SA 3.0
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May 29, 2013 at 19:19 history edited Dietrich Burde CC BY-SA 3.0
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May 29, 2013 at 19:05 history answered Dietrich Burde CC BY-SA 3.0