This function returns 1 when the two line segments intersect, and returns 0 when they do not intersect
22
Expression 23: left brace, left brace, "p" Subscript, 0 , Baseline "p" Subscript, 1 , Baseline less than or equal to 0 : 1 , 0 , right brace plus left brace, "p" Subscript, 2 , Baseline "p" Subscript, 3 , Baseline less than or equal to 0 : 1 , 0 , right brace equals 2 : 1 , 0 , right bracep0p1≤0:1,0+p2p3≤0:1,0=2:1,0