Formula_5967

\[\begin{gathered}x^{\mu} \rightarrow x^{\mu}, x^{\prime 0}=x^{0}, \\x^{\prime}=x^{i} \cos \alpha+x^{j} \sin \alpha, \\x^{\prime}{ }^{j}=x^{j} \cos \alpha-x^{i} \sin \alpha\end{gathered}\]