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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

Ideal F-norms on C*-algebrasunitary operator

Differences of Idempotents In C*-Algebras and the Quantum Hall Effect
n + 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

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