Does sage have analog of magma function IsIsomorphic?

asked 2012-12-26 00:56:53 -0500

petRUShka gravatar image

updated 2017-01-08 05:09:16 -0500

FrédéricC gravatar image

Does Sage have analog of magma function IsIsomorphic for curves

IsIsomorphic(C, D) : Crv, Crv -> BoolElt,MapSch

Given irreducible curves C and D this function returns true is C and D are isomorphic over their common base field. If so, it also returns a scheme map giving an isomorphism between them. The curves C and D must be reduced. Currently the function requires that the curves are not both genus 0 nor both genus 1 unless the base field is finite.

or IsIsomorphic for hyperelliptic curves?

IsIsomorphic(C1, C2) : CrvHyp, CrvHyp -> BoolElt, MapIsoSch

SetVerbose("CrvHypIso", n):         Maximum: 3

This function returns true if and only if the hyperelliptic curves C1 and C2 are isomorphic over their common base field. If the curves are isomorphic, an isomorphism is returned.

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