associatedLineInP11 -- compute the associated line in the P11 of a-variables
Synopsis
Usage:
lineInP11 = r associatedLineInP11(subsLine,relPfaf)
Inputs:
subsLine, a matrix, row matrix containing the variables of the normalized set-up with the a-variables being replaced by the assignments from the chosen line
relPfaf, a matrix, row matrix containing the quadratic (Pfaffian) relations
Given the row matrix subsLine where the a-variables have been replaced by linear combinations of x0,x1 parametrizing a line in ℙ11, the procedure computes the corresponding line as a variety of ℙ11.