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Aug 17, 2011 at 11:18 vote accept Salvo Tringali
Jul 19, 2011 at 18:43 comment added Salvo Tringali Ah! I had completely missed that... The only difference between your proof and mine is that I'm stating it in the language of $\varepsilon$-pseudospectra, but it makes no real difference, indeed.
Jul 19, 2011 at 18:23 comment added Bill Johnson No; I took your question as a "challenge" and came up with this proof. It is not quite as elementary as the usual proof.
Jul 19, 2011 at 18:21 history edited Bill Johnson CC BY-SA 3.0
Formatting.
Jul 19, 2011 at 18:06 comment added Salvo Tringali Voilà! This is (almost) exactly the proof that I had in mind myself. Any reference?
Jul 19, 2011 at 13:59 history answered Bill Johnson CC BY-SA 3.0