# scrollDegrees -- Computes the degree of a section of a bundle on the scroll ring corresponding to a polynomial in the Cox ring

## Synopsis

• Usage:
scrollDegrees(ab',e)
• Inputs:
• ab', a list, containing the bidegree of polynomial in the Cox ring
• e, a list, the type of the scroll
• Outputs:
• ab, a list, containing the bidegree on the scroll

## Description

This function computes integers a and b such that $H^0(O_{P(E)}(aH+bR))$ corresponds to basis($\{a',b'\}$,Rcox), where Rcox is the Cox ring of the scroll $P(E)$.