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Nov 28, 2014 at 17:18 vote accept M.González
Nov 28, 2014 at 16:41 comment added Bill Johnson Your clarification of "spectrum" was essential, since every bounded operator on a normed space has an approximate eigenvalue.
Nov 28, 2014 at 13:22 answer added André Henriques timeline score: 14
Nov 28, 2014 at 11:24 history edited M.González CC BY-SA 3.0
explaining notation
Nov 28, 2014 at 10:33 history asked M.González CC BY-SA 3.0