self-adjoint operator, such that $T^2=T^3,$ is orthogonal projection.
90757
$T$ self-adjoint on Hilbert space $H$, $T^n=T^{n+1}$ will $T$ be an orthogonal projection operator?
56211
An operator that commutes with another operator $T$ with distinct characteristic values is a polynomial in $T$
81188
$SO(3)$, orbital angular momentum, vector product
46435
2-norm of the orthogonal projection
146839
Orthogonal Projection onto the $ {L}_{\infty} $ Unit Ball
52198
Why is every selfadjoint operator closed?
258
Existence of orthogonal coordinates on a Riemannian manifold
121047
Proof: Sum of dimension of orthogonal complement and vector subspace
54668
Proof for the completeness of eigenfunctions of a self-adjoint operator
69474
Orthogonal projections with $\sum P_i =I$, proving that $i\ne j \Rightarrow  P_{j}P_{i}=0$
55533
Tensor Product: Hilbert Spaces
133711
Orthogonal basis for infinite-dimensional vector spaces
121802
Prove that every self-adjoint unitary linear operator can be expressed in the form $U\alpha = \beta - \gamma$
46669
How can I prove these are the adjoint operators?
65888
A counterexample to theorem about orthogonal projection
131906
"An operator is hermitian". Implications?
22297
Normal operator $\Rightarrow$ S invariant implies $S^\perp$ invariant