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funct-an1997
On Matrix-Valued Herglotz Functions
Fritz Gesztesy, Eduard Tsekanovskii
We provide a comprehensive analysis of matrix-valued Herglotz functions and illustrate their applications in the spectral theory of self-adjoint Hamiltonian systems including matri…
funct-an1997
An Addendum to Krein's Formula
Fritz Gesztesy, Konstantin A. Makarov, Eduard Tsekanovskii
We provide additional results in connection with Krein's formula, which describes the resolvent difference of two self-adjoint extensions A_1 and A_2 of a densely defined closed sy…