On the unitary similarity of matrix familiesThe classical Specht criterion for the
unitary similarity between two complex n × n matrices
On the unitary similarity of matrix familiesThe classical Specht criterion for the
unitary similarity between two complex n × n matrices
On invertibility of some operator sums invertible. It is shown that for
unitary operators U, V the
operator U + V is invertible if and only
Absolute continuity of spectral shift for functions of contractions, dissipative
operators,
unitary operators and self-adjoint
operators. To establish
Differences of idempotents in C*-algebras = Q* and I is the identity
operator in H. If U = P − Q is an isometry then U = U* is
unitary and Q = I
On hermitian operators X and Y meeting the condition -Y ≤ X ≤ YWe obtain a description of all pairs of Hermitian
operators X and Y, which satisfy the condition -Y
On invertibility of some operator sums invertible. It is shown that for
unitary operators U, V the
operator U + V is invertible if and only
Differences of Idempotents In C*-Algebras and the Quantum Hall Effectn + 1, the symmetry
operators U, V ∈ B(H), and W = U − V. Then the
operator W is not a symmetry
On hermitian operators X and Y meeting the condition -Y ≤ X ≤ YWe obtain a description of all pairs of Hermitian
operators X and Y, which satisfy the condition -Y