Let t be a skew-adjoint operator on an inner product space V such that \(\rm t ^* t=\hat{0}\). Then
1
\(\rm t \neq \hat{0} .\)
2
\(\rm t=\hat{0} . \)
3
t = constant.
4
\(\rm t=\hat{t} .\)
Let t be a skew-adjoint operator on an inner product space V such that \(\rm t ^* t=\hat{0}\). Then