I have difficulty proving:
If $T$ is a normal operator in a Hilbert space, $T$ is surjective if and only if $T^*$ surjective.
Please give me some help. Thank you.
I have difficulty proving:
If $T$ is a normal operator in a Hilbert space, $T$ is surjective if and only if $T^*$ surjective.
Please give me some help. Thank you.