A_{1}: (1, 0, 1)
B_{1}: (10, 6, 4)
u = Vector(A_{1}, B_{1})
A_{2}: (0, 2, 2)
B_{2}: (4, 2, 2)
v = Vector(A_{2}, B_{2})
f = Line(A_{2}, B_{2})
g = Line(A_{1}, B_{1})
w = Vector(A_{1}, A_{2})
delta: ((u ⊗ v) * w)