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Nov 25, 2018 at 13:03 comment added Hannes Since the question gets bumped to the front page every now and then, I want to add that, yes, the corresponding general statement about interpolation spaces is claimed in the book of Luc Tartar as mentioned in this answer. I however think that there is a gap in the proof. I have written to Luc Tartar already but we have not been able to clarify the problematic step in the proof so far. (And personally I doubt that it will be true without additional assumptions on the operator such as the one in my question..)
Sep 18, 2017 at 15:52 review Late answers
Sep 18, 2017 at 16:17
Sep 18, 2017 at 15:37 history answered Infojoe CC BY-SA 3.0