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Apr 23, 2015 at 15:24 comment added aa500 @macbeth Sorry about late reply. No I am not aware of such things. Maybe worth checking out then.
Feb 4, 2015 at 0:43 comment added macbeth Just checking -- are you aware of work (including various pathologies) on the corresponding question for linear operators in general? For example, in Kato, <em>Perturbation Theory for Linear Operators</em>.
Jan 24, 2015 at 19:51 review First posts
Jan 24, 2015 at 20:48
Jan 24, 2015 at 19:46 history asked aa500 CC BY-SA 3.0