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when toggle format what by license comment
Jan 27, 2019 at 12:05 vote accept Student
Jan 20, 2019 at 16:27 comment added Fedor Petrov $\phi^{-1}(...) $
Jan 20, 2019 at 14:21 comment added Student Please why you mean by preimage?
Jan 20, 2019 at 13:31 history answered Fedor Petrov CC BY-SA 4.0