In this paper we consider the truncated shift operator Su on the model space K2u := H2 θ uH2. We say that a complex number λ is an extended eigenvalue of Su if there exists a nonzero operator X, called extended eigenvector associated to λ, and satisfying the equation SuX = λXSu. We give a complete description of the set of extended eigenvectors of Su, in the case of u is a Blaschke product..
@article{bwmeta1.element.doi-10_2478_conop-2012-0003, author = {Hasan Alkanjo}, title = {On extended eigenvalues and extended eigenvectors of truncated shift}, journal = {Concrete Operators}, volume = {1}, year = {2013}, pages = {19-27}, zbl = {1290.47028}, language = {en}, url = {http://dml.mathdoc.fr/item/bwmeta1.element.doi-10_2478_conop-2012-0003} }
Hasan Alkanjo. On extended eigenvalues and extended eigenvectors of truncated shift. Concrete Operators, Tome 1 (2013) pp. 19-27. http://gdmltest.u-ga.fr/item/bwmeta1.element.doi-10_2478_conop-2012-0003/
[1] H. Bercovici. Operator theory and arithmetic in H1, volume 26 of Mathematical Surveys and Monographs. American Mathematical Society, Providence, RI, 1988.
[2] A. Biswas and S. Petrovic. On extended eigenvalues of operators. Integral Equations Operator Theory, 55(2):233–248, 2006. | Zbl 1119.47019
[3] N. K. Nikol0ski˘ı. Treatise on the shift operator, volume 273 of Grundlehren der Mathematischen Wissenschaften [Fundamental Principles of Mathematical Sciences]. Springer-Verlag, Berlin, 1986. Spectral function theory, With an appendix by S. V. Hrušcev [S. V. Khrushchëv] and V. V. Peller, Translated from the Russian by Jaak Peetre.
[4] M. Rosenblum. On the operator equation BX − XA = Q. Duke Math. J., 23:263–269, 1956.
[5] D. Sarason. Free interpolation in the Nevanlinna class. In Linear and complex analysis, volume 226 of Amer. Math. Soc. Transl. Ser. 2, pages 145–152. Amer. Math. Soc., Providence, RI, 2009. | Zbl 1183.30031
[6] B. Sz.-Nagy and C. Foias. Harmonic analysis of operators on Hilbert space. Translated from the French and revised. North-Holland Publishing Co., Amsterdam, 1970. | Zbl 0201.45003