Formula_19855

\[\begin{gathered}\xi_{\lambda_{1} \varphi_{1}}+\lambda_{2} \varphi_{2}=\lambda_{1} \xi_{\varphi_{1}}+\lambda_{2} \xi_{\varphi_{2}}, \\\varphi_{1}, \varphi_{2} \in E, \lambda_{1}, \lambda_{2} \in \mathbb{R}^{1} . \\F(\varphi)=\left\langle\exp \left(i \xi_{\varphi}\right)\right\rangle\end{gathered}\]