Linear Algebra, Inner Product, Cross Product, Orthogonality.
a3) and b = (b1, b2, b3), their cross product c = a × b is a vector determined as follows: The first component: c1 = a2b3 — a3b2 The second component: c2 = a3b1 — a1b3 The third component: c3 = a1b2 — a2b1 This vector c is perpendicular to the original vectors a and b. The magnitude of c |c|