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Comments for physicspages.com 
VECTORS AS QUATERNIONS
In the equation
qr = (ae − bf − cg − dh)
+ a (f i + gj + hk)
+ e (bi + cj + dk)
+ (ch − dg) i − (bh − ce) j + (bg − cf ) k
(7)
I believe “(bh-ce)” should be “(bh-df)”.
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Fixed now. Thanks.
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So good to see you back!
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Thanks
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Sample comment.
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