-Scalar operators on cyclic spaces
Characteristic operator functions on Wachs spaces.
Commuting Nonselfadjoint Operators and their Characteristic Operator-Functions
* Partially supported by Grant MM-428/94 of MESC.In this paper we present some generalizations of results of M. S. Livšic [4,6], concerning regular colligations (A1, A2, H, Φ, E, σ1, σ2, γ, ˜γ) (σ1 > 0) of a pair of commuting nonselfadjoint operators A1, A2 with finite dimensional imaginary parts, their complete characteristic functions and a class Ω(σ1, σ2) of operator-functions W(x1, x2, z): E → E in the case of an inner function W(1, 0, z) of the class Ω(σ1). ...
Constants Related to Operators of Class Cp.
Contractions similar to isometries
Contractive couplings
Contributions à l'étude spectrale des contractions de l'espace de Hilbert