Remake Quaternions
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That said when quaternions are used in geometry, it is more convenient to define them as a scalar plus a vector.
An equivalent definition of Quaternion (
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Binary Operation
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Binary Operation
- Absorbing element of operator
∘ : 0 p,q∈Q,p≠0∧q≠0⇒p∘q≠0 p=(a+u)q=(b+v)p∘q=0⎫⎭⎬⎪⎪⇒u×v=0⇒...⇒p=0∨q=0 ∘ is associative(a+u)∘(b+v)∘(c+w)=a∘b∘c+a∘b∘w+a∘v∘c+a∘v∘w+u∘b∘c+u∘b∘w+u∘v∘c+u∘v∘w u∘v∘w=(xi+yj+zk)∘(x′i+y′j+z′k)∘(x′′i+y′′j+z′′k) - Identity element of
∘ : 1 - Inverse of q
(Q−{0};∘) is a Group- Thus,
(Q;+;∘) is a Division Ring
The Next: (Rodrigues’) Rotation Formula
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