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Jun 25, 2012 at 4:47 comment added Anatoly Kochubei I meant a variety of methods which can be helpful in other situations too.
Jun 24, 2012 at 19:17 comment added Paul There is a lot of theorems indeed, and maybe I have missed something, but I couldn't find anything that would help me. The problem is that my operator $A$ is not a Schroedinger operator.
Jun 23, 2012 at 15:38 history answered Anatoly Kochubei CC BY-SA 3.0