# Quaternion Addition = An Inertial Observer

Posted by doug
summary:
Quaternion addition results in constant linear motion, the only motion covered in special relativity.
description:
Quaternion addition is the simplest of all math actions one can do. The animation is also easy to understand: a dot moves at a steady pace.
command:
q_graph -dir vp -out addition -loop 0 -box 2 -command 'q_add_n -2 2 -2 .5 .004 -.003 .0035 -.001 1000'
$q_a+n*q_b=q_{abn}$