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2021-01-04 15:20:40 +0200 | asked a question | inverse image under ring homomorphism Hi there! Just starting to learn Sage and can't get why both Referring to the generators of Thanks! |
2021-01-04 15:20:40 +0200 | asked a question | Inverse image under homomorphism Hi there! Just starting to learn sage and can't get why both queries above return "element y (y^2) does not have preimage" while y^2 clearly has x as preimage. Referring to the generators of R1 and R2 explicitly doesn't help either. Thanks! |