Function: hyperellisisom
Section: elliptic_curves
C-Name: hyperellisisom
Prototype: GGDG
Help: hyperellisisom(C1, C2, {nf}): C1 and C2 being two hyperelliptic curve given by Weierstrass
 equations, either over the rationals or over the number field nf if given,
 return the list of isomorphisms from C1 to C2 as changes of coordinates of the
 form [e, [a,b;c,d], H].
Doc: $C1$ and $C2$ being two hyperelliptic curve given by Weierstrass
 equations, either over the rationals or over the number field \var{nf} if given,
 return the list of isomorphisms from $C1$ to $C2$ as changes of coordinates of the
 form \kbd{[e, [a,b;c,d], H]}.
