Quaternion products with fewer real products

1 · John Cook · June 16, 2021, 4:28 p.m.
A couple days ago I wrote about Gauss’ trick to multiply two complex numbers using only 3 real multiplications. This post will do something similar with quaternions. Just as the most direct approach to computing complex products requires 4 real multiplications, the most direct approach to quaternion products requires 16 real multiplications. (See the function […] The post Quaternion products with fewer real products first appeared on John D. Cook....