Exercise 5.2.1 What happens to the parabolic projectivity[i] ACC[/i] projective to[i] A1CC [/i]when[i] PQ[/i] is the line at infinity? As opposed to the figure associated with theorem 5.21, the figure displayed here is constructed so that [i]P[/i] can be adjusted and brought to be horizontal with point[i] Q[/i] projecting the intersection of the line [i]QP[/i] and [i]AC[/i] to infinity.