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1997 | 66 | 1 | 239-252
Tytuł artykułu

Analytic formulas for the hyperbolic distance between two contractions

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In this paper we give some analytic formulas for the hyperbolic (Harnack) distance between two contractions which permit concrete computations in several situations, including the finite-dimensional case. The main consequence of these formulas is the proof of the Schwarz-Pick Lemma. It modifies those given in [13] by the avoidance of a general Schur type formula for contractive analytic functions, more exactly by reducing the case to the more manageable situation when the function takes as values strict contractions.
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autor
  • Institute of Mathematics, Romanian Academy, P.O. Box 1-764, RO-70700, Bucharest, Romania
Bibliografia
  • [1] T. Ando, I. Suciu and D. Timotin, Characterization of some Harnack parts of contractions, J. Operator Theory 2 (1979), 233-245.
  • [2] S. Dineen, The Schwarz Lemma, Clarendon Press, Oxford, 1989.
  • [3] C. Foiaş, On Harnack parts of contractions, Rev. Roumaine Math. Pures Appl. 19 (1974), 314-318.
  • [4] C. Foiaş and A. E. Frazho, The Commutant Lifting Aproach to Interpolation Problems, Oper. Theory Adv. Appl. 44, Birkhäuser, Basel, 1990.
  • [5] V. A. Khatskevich, Yu. L. Shmul'yan and V. S. Shul'man, Equivalent contractions, Dokl. Akad. Nauk SSSR 278 (1) (1984), 47-49 (in Russian); English transl.: Soviet Math. Dokl. 30 (2) (1984), 338-340.
  • [6] V. A. Khatskevich, Yu. L. Shmul'yan and V. S. Shul'man, Pre-orders and equivalences in the operator ball, Sibirsk. Mat. Zh. 32 (3) (1991) (in Russian); English transl.: Siberian Math. J. 32 (3) (1991), 496-506.
  • [7] W. Mlak, Hilbert Spaces and Operator Theory, PWN-Kluwer, Warszawa-Dordrecht, 1991.
  • [8] G. Pick, Über die Beschränkungen analytischer Funktionen, welche durch vorgegebene Funktionswerte bewirkt werden, Math. Ann. 77 (1916), 7-23.
  • [9] H. A. Schwarz, Zur Theorie der Abbildung, in: Gesammelte Mathematische Abhandlungen, Band II, Springer, Berlin, 1890, 108-132.
  • [10] S. Stoilow, Theory of Functions of a Complex Variable, I, II, Editura Academiei, Bucureşti, 1954, 1958 (in Romanian).
  • [11] I. Suciu, Harnack inequalities for a functional calculus, in: Hilbert Space Operators and Operator Algebras (Proc. Internat. Conf., Tihany, 1970), Colloq. Math. Soc. János Bolyai 5, North-Holland, Amsterdam, 1972, 449-511.
  • [12] I. Suciu, Analytic relations between functional models for contractions, Acta Sci. Math. (Szeged) 33 (1973), 359-365.
  • [13] I. Suciu, Schwarz Lemma for operator contractive analytic functions, preprint IMAR No. 5, 1992.
  • [14] I. Suciu, The Kobayashi distance between two contractions, in: Oper. Theory Adv. Appl. 61, Birkhäuser, Basel, 1993, 189-200.
  • [15] I. Suciu and I. Valuşescu, On the hyperbolic metric on Harnack parts, Studia Math. 55 (1976), 97-109.
  • [16] N. Suciu, On Harnack ordering of contractions, Bull. Acad. Polon. Sci. Sér. Sci. Math. 27 (1979), 467-471.
  • [17] B. Sz.-Nagy and C. Foiaş, Harmonic Analysis of Operators on Hilbert Space, North-Holland-American Elsevier-Akademiai Kiadó, Amsterdam-New York-Budapest, 1970.
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