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Nov 4, 2015 at 10:20 comment added M. Lin Wang-Zhang's inequality was revisited in my little note: Remarks on Krein’s Inequality link.springer.com/article/10.1007/s00283-011-9270-z
Mar 31, 2015 at 11:06 vote accept Martijn
Nov 8, 2012 at 17:04 comment added Suvrit @Martijn: I had once obtained the above ineq. as a special case of something else; if i recall the context, i'll update the answer. some reasonable generalization is certainly possible because the above ineq. is really just the triangle ineq. in disguise.
Nov 8, 2012 at 8:15 comment added Martijn Thanks for posting this answer. Any chance that something can be done if $U$ or $V$ have an eigenvalue not on the unit circle?
Nov 8, 2012 at 5:48 history answered Suvrit CC BY-SA 3.0