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Operator Theory and Interpolation: International Workshop on by Daniel Alpay, Aad Dijksma, Heinz Langer (auth.), Hari PDF

By Daniel Alpay, Aad Dijksma, Heinz Langer (auth.), Hari Bercovici, Ciprian I. Foias (eds.)

ISBN-10: 3034884222

ISBN-13: 9783034884228

ISBN-10: 3034895607

ISBN-13: 9783034895606

Systems and regulate theories use refined operator theoretical equipment. additionally they supply new principles and difficulties in operator idea. subsequently, the biannual MTNS (Mathematical thought of Networks and platforms) convention is attended by means of many operator theorists. on the initiative of J.W. Helton and that i. Gohberg, a global Workshop on Operator conception and purposes (IWOTA) has been geared up because the early 80s, as a satellite tv for pc of MTNS. The articles during this quantity originated from the IWOTA convention held at Indiana collage, Bloomington, in June 1996. They symbolize many of the parts that have been mentioned on the workshop with a few emphasis on sleek interpolation concept, an issue which has noticeable a lot development lately. The contributions have been, as ordinary, topic to an intensive refereeing approach and should convey the reader to the leading edge of present examine during this area.

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G. Julia, Principes Geometrique d'Analyse, Gauthiers-Villars, Paris, Volume I (1930), Volume II (1932). G. Krein, Fundamental aspects of the representation theory of Hermitian operators with deficiency index (m, m), Ukr. Mat. Zh. : Amer. Math. Soc. Transl. (2) 97 (1970), 75-143. V Katsnelson, A. Kheifets and P. A. ), Operators in function spaces and problems in function theory, Naukova Dumka, Kiev, 1987, 83-96. LV Kovalishina and VP. Potapov, An indefinite metric in the Nevanlinna-Pick problem, Akad.

2, the limit lim Kn(t;, 11) Il~OO = K(t;, 11), t;,1') E Q, 11. The case t; =1= 11 then follows from the Cauchy-Schwarz exists when t; inequality. 5) K(CI1) = X I (n] X2(11)* - ] r * ' ~ -11 Classical Nevanlinna-Pick Interpolation with Real Interpolation Points where X,(S) X2(S)* = = 39 iM(Lf-l*)=iJ+i(~-f-l)K(~,f-l*), iM(f-l, S) = iJ + i(f-l - ~*)K(f-l, n- At this stage the proof breaks into two cases. (l) The first case is when all the ell are analytic in a fixed neighbourhood of a real point. Then in the preceding analysis one can take f-l E IR and one obtains that X, = X2 =: e.

A. Dijksma, H. S. V de Snoo, Eigenvalues and pole functions of Hamiltonian systems with eigenvalue parameter depending boundary conditions, Math. Nachr. 161 (1993), 107-154. H. Dym, J contractive matrix functions, reproducing kernel Hilbert spaces and interpolation, Regional conference series in mathematics 71, Amer. Math. , 1989. H. P. McKean, Gaussian processes,function theory, and the inverse spectral problem, Academic Press, New York, 1976. L. Gorbachuk and VI. G. Krein's lectures on entire operators, Birkhauser, Basel, monograph in preparation.

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Operator Theory and Interpolation: International Workshop on Operator Theory and Applications, IWOTA 96 by Daniel Alpay, Aad Dijksma, Heinz Langer (auth.), Hari Bercovici, Ciprian I. Foias (eds.)


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