We say that $\varphi$ is non-degenerate if and only if $E^{\perp\varphi} = \{0\}$. Show that $\varphi$ is non-degenerate if and only if $h$ is an isomorphism.
We say that $\varphi$ is non-degenerate if and only if $E^{\perp\varphi} = \{0\}$.
Show that $\varphi$ is non-degenerate if and only if $h$ is an isomorphism.