What is the weakest known condition under which a Weyl-type eigenvalue perturbation inequality holds? Does some analogue hold for normal matrices, for example?
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3$\begingroup$ You may find sciencedirect.com/science/article/pii/002437959290047E interesting or also sciencedirect.com/science/article/pii/0024379594003548 and also isid.ac.in/~statmath/2007/isid200703.pdf $\endgroup$– SuvritCommented Feb 7, 2016 at 15:32
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