Property of Orthogonal matrix
1865
Sub-determinants of an orthogonal matrix
117175
Proof that the 2-norm of orthogonal transformation of a matrix is invariant
5506
Perturbation property of Orthonormal basis for Hilbert space
104036
Right eigenvector λ and left eigenvector are orthogonal.
84522
A better proof for $\det(P) = \pm1$ if $P$ is an orthogonal matrix
111769
Why is inverse of orthogonal matrix is its transpose?
18205
Orthogonal Projection
65888
A counterexample to theorem about orthogonal projection
129345
Name for matrices with orthogonal (not necessarily orthonormal) rows
154628
What should we understand from the definition of orthogonality in inner product spaces other than $\mathbb R^n$?
60723
Prove that if $A$ is normal, then eigenvectors corresponding to distinct eigenvalues are necessarily orthogonal (alternative proof)
25335
Orthogonal matrix over cross product
41436
rank of complex conjugate transpose matrix property proof
18012
Eigenvectors of real symmetric matrices are orthogonal
97994
Orthogonality Relations Exercise, Brezis' Book Functional Analysis
69497
Show that the set of all $n \times n$ orthogonal matrices, $O(n)$, is a compact subset of $\mbox{GL} (n,\mathbb R)$
134306
If $A$ is a normal matrix such that $A^{247} = A^{246}$, how to prove that $A$ is an orthogonal projection?