Hello,

I have been trying to read up on quaternion algebra, and came across the 
white papers documentation for Chrono. This is a very helpful resource. I 
have been able to follow the rotations document, however have run into 
issues with the frame kinematics document. 

Specifically, I am struggling to understand, on page 5 in the section 
Product: the velocity part, how does the following hold true - 

dq(b,c)/dt . r(a,b) . q*(b,c) + q(b,c) . r(a,b) . dq*(b,c)/dt = 2 
dq(b,c)/dt . r(a,b) . q*(b,c)

Best,
Ashesh Sharma

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