reiffen(p,q)
Reiffen's (p,q)-curve is a singular curve defined by $f_{p,q} = x_1^p+x_2^q+x_1x_2^{q-1} = 0$ for $p>=4$ and $q>=p+1$.
i1 : reiffen(4,5) 4 5 4 o1 = x x + x + x 1 2 2 1 o1 : QQ[x ..x ] 1 2
The object reiffen is a method function.