Jan 1, 0001
$\lambda \in \rho(A) \Leftrightarrow$ $A_\lambda$ ограничен снизу
$\lambda \in \sigma(A) \Leftrightarrow \exists{x_n}:,,|x_n|=1,,,|A_\lambda x_n| \rightarrow 0$
Jan 1, 0001
$\lambda \in \rho(A) \Leftrightarrow$ $A_\lambda$ ограничен снизу
$\lambda \in \sigma(A) \Leftrightarrow \exists{x_n}:,,|x_n|=1,,,|A_\lambda x_n| \rightarrow 0$