Invariant Subspace of Two Operators
48111
Invariant Subspace of Two Linear Involutions
109471
The eigenvectors of the transpose operator
66283
Let V be a vector space. If every subspace of V is T-invariant, prove that there exist a scalar multiple c such that T=c1v
155123
Selfadjoint Operator: Basic Criterion
55067
Norm of self-adjoint operator
5506
Perturbation property of Orthonormal basis for Hilbert space
122853
Show that $\operatorname{rank}(A) = \operatorname{rank}(B)$
4717
The union of linear subspaces is not necessarily a subspace
123665
A question in Subspaces in linear algebra
14429
dimension of a subspace spanned by two subspaces
108657
Cross product of the quantum mechanical operators $\textbf{p}$ and $\textbf{A}$
87897
Bounded operators on separable Hilbert spaces
119352
compact and self adjoint square root of an operator
35625
Direct sum of orthogonal subspaces
26529
How to identify "naturally" two subspaces?
73286
Show that the set of all symmetric, real matrices is a subspace, determine the dimension
18921
Linear Transformations: Proving 1 dimensional subspace goes to 1 dimensional