- #1
math8
- 160
- 0
How do you prove that a projector is normal if and only if it is self adjoint?
I know a matrix P is a projector if [tex]P=P^{2}[/tex] and P is normal if PP* = P*P and P is self adjoint (or hermitian) if P= P*.
I think I know how to prove that if the projector P is self adjoint then P is normal.
But I am not sure how to proceed to prove that if the projector P is normal, then it is Self adjoint.
I know a matrix P is a projector if [tex]P=P^{2}[/tex] and P is normal if PP* = P*P and P is self adjoint (or hermitian) if P= P*.
I think I know how to prove that if the projector P is self adjoint then P is normal.
But I am not sure how to proceed to prove that if the projector P is normal, then it is Self adjoint.