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Oct 27, 2020 at 8:13 vote accept Dominic van der Zypen
Oct 26, 2020 at 11:15 history edited Random CC BY-SA 4.0
added 1916 characters in body
Oct 26, 2020 at 10:44 comment added Dominic van der Zypen This question is not about the image of $\sigma$, but about pre-images / fibers. Is the wording of the question bad, or is the question hard to understand? It is also possible that the question contains an error. I am open to amending the question
Oct 26, 2020 at 10:32 history answered Random CC BY-SA 4.0