Formula_2623

\[\left.\begin{array}{c}1 i=i, 1 j=j, 1 k=k, 1^{2}=1, i^{2}=j^{2}=k^{2}=-1, \\j i=-j i=k, k i=-i k=j, j k=-k j=i .\end{array}\right\}\]