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Nov 14, 2017 at 16:12 comment added José Navarro Thanks a lot for the answer. Now I see the type of statements that can be proved. (By the way, I have edited the question, to unify notations and try to state it more clearly).
Nov 14, 2017 at 16:07 vote accept José Navarro
Nov 10, 2017 at 10:57 history answered Neil Strickland CC BY-SA 3.0