Spectral Theory of Canonical Differential Systems. Method of Operator Identities

Spectral Theory of Canonical Differential Systems. Method of Operator Identities
Author :
Publisher : Birkhäuser
Total Pages : 201
Release :
ISBN-10 : 9783034887137
ISBN-13 : 3034887132
Rating : 4/5 (132 Downloads)

Book Synopsis Spectral Theory of Canonical Differential Systems. Method of Operator Identities by : L.A. Sakhnovich

Download or read book Spectral Theory of Canonical Differential Systems. Method of Operator Identities written by L.A. Sakhnovich and published by Birkhäuser. This book was released on 2012-12-06 with total page 201 pages. Available in PDF, EPUB and Kindle. Book excerpt: The spectral theory of ordinary differential operators L and of the equations (0.1) Ly= AY connected with such operators plays an important role in a number of problems both in physics and in mathematics. Let us give some examples of differential operators and equations, the spectral theory of which is well developed. Example 1. The Sturm-Liouville operator has the form (see [6]) 2 d y (0.2) Ly = - dx + u(x)y = Ay. 2 In quantum mechanics the Sturm-Liouville operator L is known as the one-dimen sional Schrodinger operator. The behaviour of a quantum particle is described in terms of spectral characteristics of the operator L. Example 2. The vibrations of a nonhomogeneous string are described by the equa tion (see [59]) p(x) ~ o. (0.3) The first results connected with equation (0.3) were obtained by D. Bernoulli and L. Euler. The investigation of this equation and of its various generalizations continues to be a very active field (see, e.g., [18], [19]). The spectral theory of the equation (0.3) has also found important applications in probability theory [20]. Example 3. Dirac-type systems of the form (0.4) } where a(x) = a(x), b(x) = b(x), are also well studied. Among the works devoted to the spectral theory of the system (0.4) the well-known article of M. G. KreIn [48] deserves special mention.


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