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when toggle format what by license comment
Aug 25, 2017 at 19:10 comment added Nik Weaver Oops, $0$ is also an eigenvalue of $c$. That doesn't change anything, though.
Apr 20, 2015 at 16:58 vote accept Iian Smythe
Apr 20, 2015 at 16:10 history answered Nik Weaver CC BY-SA 3.0