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Sep 5, 2013 at 16:23 history edited Pietro Majer CC BY-SA 3.0
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Apr 26, 2012 at 6:49 comment added Pietro Majer Note that no symmetry or positivity assumption is needed; you may solve your equation this way in any Banach algebra.
Apr 25, 2012 at 21:59 vote accept Bernard
Apr 25, 2012 at 21:51 history edited Pietro Majer CC BY-SA 3.0
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Apr 25, 2012 at 21:38 history answered Pietro Majer CC BY-SA 3.0