Sufficient condition for orthogonal projection
18205
Orthogonal Projection
155123
Selfadjoint Operator: Basic Criterion
127025
Diagonalization of a projection
46435
2-norm of the orthogonal projection
81884
Minimal sufficient statistic of $\operatorname{Uniform}(-\theta,\theta)$
113779
If $P$ is an orthogonal matrix its columns form an orthonormal set.
141015
Proof of orthogonal matrix
9436
How to define an orthogonal basis in the right way?
132595
$\sup_{0 \leq M \leq I_{\mathcal{H}_1}} \frac{\operatorname{Tr}[\rho M]}{\operatorname{Tr}[\sigma M]}$ satisfies Data Processing Inequality
6960
Necessary and sufficient condition for the matrix $A = I - 2 x x^t$ to be orthogonal
9138
Projection of a point onto a simple convex polytope
145885
Linear transformation preserving orthogonality
16692
a representation condition of Hilbert space
131589
Projections appropriate for global analysis that preserve area and that preserve distance (but not necessarily in the same projection)
84437
Prove that the projection $p_i$ from the product space $X_I S_i \tau$ into $S_i \tau_i$ is open for each $i \in I$
133149
Inverse of a Positive Definite
37794
Proving the two given vectors are orthogonal