7.3.1 modular.cusps - The set $ \mathbf{P}^1(\mathbf{Q})$ of cusps

The module modular.cusps defines the following classes:

class Cusp
A cusp.

A cusp is either a rational number or infinity, i.e., an element of the projective line over Q. A Cusp is stored as a pair (a,b), where gcd(a,b)=1 and a,b are of type Integer.



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