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Apr 21, 2021 at 18:34 vote accept Parseval
Apr 18, 2021 at 15:12 vote accept Parseval
Apr 21, 2021 at 18:34
Apr 17, 2021 at 19:11 answer added ir7 timeline score: 2
Apr 17, 2021 at 18:37 comment added nbbo2 Yes, it is a trivial proof. You are allowed to change the name of the "bound variable" t to another name such as s. (Just like renaming a local variable inside a computer program does not affect the value the program returns).
Apr 17, 2021 at 18:18 history asked Parseval CC BY-SA 4.0