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Gabor Szegö: Collected Papers

1945–1972

Birkhäuser Boston,
Buch
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Kurzbeschreibung

1. 1. Definition of L-forms. In the years 1907-1911 O. Toeplitz [21, 22, 23, 24]* studied a class of quadratic forms whose matrix is of the follO\\"ing type: (Ll) C-2 C_I Co C-n-I Cn-I The elements Cn are given complex constants. Toeplitz designated these forms as L-forms and investigated in detail their relation to the analytic function defined in a neighborhood of the unit circle by the Laurent series 2; C z", n = n - 00, . . . , 00; this series is assumed to be convergent in a certain circular ring rl < I z I < r2, rl < 1 < r2. It is obvious that these matrices are connected with the infinite cyclic group, just as the finite cyclic matrix CO CI C2 C Co CI n r (1. 2) Cn-I C Co n L. c, c, Co is associated with the finite cyclic group. The main result of Toeplitz is that the spectrum of the L-form is identical with the complex values the Laurent series assumes on the unit circle I z I = 1. 1. 2. Hermitian forms. The case C = en is of particular importance; the n matrix (1. 1) is in this case a Hermitian one and the associated Laurent series i8 represents a real function f(8) on the unit circle z = e , -'II" ~ 8 < '11".

Details

Titel: Gabor Szegö: Collected Papers
Autoren/Herausgeber: Gabor P. Szegö
Aus der Reihe: Contemporary Mathematicians
Ausgabe: Softcover reprint of the original 1st ed. 1982

ISBN/EAN: 9781461257875

Seitenzahl: 880
Format: 25,4 x 17,8 cm
Produktform: Taschenbuch/Softcover
Gewicht: 1,665 g
Sprache: Englisch

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