Geodesic
Commuting Nonselfadjoint Operators and their Characteristic Operator-Functions
Serdica Mathematical Journal, Tome 23 (1997) no. 3-4, pp. 313-334.

Voir la notice de l'article provenant de la source Bulgarian Digital Mathematics Library

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). ...
Keywords: Operator Colligation, Complete Characteristic Operator-Function, Joint Characteristic Function, Trunk 
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     title = {Commuting {Nonselfadjoint} {Operators} and their {Characteristic} {Operator-Functions}},
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Kirchev, K.; Borisova, G. Commuting Nonselfadjoint Operators and their Characteristic Operator-Functions. Serdica Mathematical Journal, Tome 23 (1997) no. 3-4, pp. 313-334. http://geodesic.mathdoc.fr/item/SMJ2_1997_23_3-4_a8/