nonnegative components of the polar expansion
Multiplicity characteristics of the continuum spectrum of a class of dissipative operators
For a class of dissipative quasi-Hermitian operators the concept of multiplicity of the continuous spectrum is introduced. A formula is presented for the characteristic matrix-function in terms of nonnegative components of the polar expansion of the difference of limiting values of this matrix-function.
scientific article; zbMATH DE number 1681776