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SPLIT QUATERNIONS AND ROTATIONS IN SEMI EUCLIDEAN SPACE E<sup>4</sup><sub>2</sub>
Kula, Levent,Yayli, Yusuf Korean Mathematical Society 2007 대한수학회지 Vol.44 No.6
We review the algebraic structure of $\mathbb{H}{\sharp}$ and show that $\mathbb{H}{\sharp}$ has a scalar product that allows as to identify it with semi Euclidean ${\mathbb{E}}^4_2$. We show that a pair q and p of unit split quaternions in $\mathbb{H}{\sharp}$ determines a rotation $R_{qp}:\mathbb{H}{\sharp}{\rightarrow}\mathbb{H}{\sharp}$. Moreover, we prove that $R_{qp}$ is a product of rotations in a pair of orthogonal planes in ${\mathbb{E}}^4_2$. To do that we call upon one tool from the theory of second ordinary differential equations.