When is orthogonal projection compact?
129549
Showing that the orthogonal projection in a Hilbert space is compact iff the subspace is finite dimensional
154628
What should we understand from the definition of orthogonality in inner product spaces other than $\mathbb R^n$?
45249
Pseudocompactness does not imply compactness
128835
Compactness of the set of $n \times n$ orthogonal matrices
1756
1-point compactification and embedding
66299
Operator whose spectrum is given compact set
133609
orthonormal system in a Hilbert space
28485
Commutativity of projection and rotation
22394
Compact operator maps weakly convergent sequences into strongly convergent sequences
9286
Questions on PCA: when are PCs independent? why is PCA sensitive to scaling? why are PCs constrained to be orthogonal?
119352
compact and self adjoint square root of an operator
6960
Necessary and sufficient condition for the matrix $A = I - 2 x x^t$ to be orthogonal
29303
Cartesian product of compact sets is compact
84999
$\exp(A)$ is orthogonal iff $A$ is skew symmetric
131589
Projections appropriate for global analysis that preserve area and that preserve distance (but not necessarily in the same projection)
108505
Matrix Concentration for Products- Orthogonality Property
40682
What's going on with "compact implies sequentially compact"?