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Natural Science, Biology, 2024, 14, 67–75
DOI: 10.xxxx/example-doi Special Issue 1(2), 2022 186–1928

On Some Analytic Operator Functions in the Theory of Hermitian Operators

Received N/A; revised N/A; accepted N/A
CC BY-NC 4.0 This work is licensed under Creative Commons Attribution–NonCommercial International License (CC BY-NC 4.0).

A densely defined Hermitian operatorA0with equal defect numbers is con-sidered. Presentable by means of resolvents of a certain maximal dissipative oraccumulative extensions ofA0, bounded linear operators acting from some defectsubspaceNγto arbitrary otherNλare investigated. With their aid are discussedcharacteristic and Weyl functions. A family of Weyl functions is described, as-sociated with a given self-adjoint extension ofA0. The specific property of Weylfunction’s factors enabled to obtain a modified formulas of von Neumann. Interms of characteristic and Weyl functions of suitably chosen extensions the re-solvent of Weyl function is presented explicitly.

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