Formula_5968

\[\begin{gathered}x^{\mu} \rightarrow x^{\prime \mu}, x^{\prime 0}=x^{0} \operatorname{ch} \beta+x^{k} \operatorname{sh} \beta, \\x^{\prime i}=x^{i}, x^{i j}=x^{j}, x^{\prime k}=x^{k} \operatorname{ch} \beta+x^{0} \operatorname{sh} \beta\end{gathered}\]