- Curve -- type of HashTable

- curve(Divisor) -- see curve -- generates a random curve
- degree(Divisor) -- computes the degree of a Divisor
- Divisor * Divisor -- intersection number of two Divisors
- Divisor + Divisor -- sum of two Divisors
- Divisor - Divisor -- difference of two Divisors
- genus(Divisor) -- computes the genus of a Divisor
- net(Divisor) -- displays the coordinates of the Divisor
- surface(Divisor) -- see surface -- the surface key of a Divisor or a Curve
- ZZ * Divisor -- multiply a Divisor by an integer