gh-37089: Implemented order computation and identity checking for automorphisms of elliptic curves
The WeierstrassIsomorphism class is also used to represent automorphisms
of elliptic curves. Sometimes one is looking for a particular
automorphism (say, of order 3 or 4), and this check is simplified with
the .order() method for elliptic-curve automorphisms.
The is_identity() method is added for convenience.
#sd123
URL: https://github.com/sagemath/sage/pull/37089
Reported by: Riccardo Invernizzi
Reviewer(s): grhkm21, Riccardo Invernizzi
