By Genrich Belitskii, Vadim Tkachenko (auth.), Daniel Alpay, Victor Vinnikov (eds.)

The notions of move functionality and attribute features proved to be basic within the final fifty years in operator concept and in procedure concept. Moshe Livsic performed a significant function in constructing those notions, and the publication incorporates a number of conscientiously selected refereed papers devoted to his reminiscence. themes comprise classical operator thought, ergodic conception and stochastic tactics, geometry of delicate mappings, mathematical physics, Schur research and method idea. the diversity of issues attests good to the breadth of Moshe Livsic's mathematical imaginative and prescient and the deep effect of his work.

The ebook will entice researchers in arithmetic, electric engineering and physics.

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Additional info for Characteristic Functions, Scattering Functions and Transfer Functions: The Moshe Livsic Memorial Volume

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UT U such that A ⊃ T ⊃ B. The real part Re A contains the quasi-kernel B This construction of A is unique due to the theorem on the uniqueness of a (∗)extension for a given quasi-kernel (see [30]). 6) for some values of parameters h and μ. 15) and V (z) = VΘΛ (z) = VΘ (z). The theorem below gives the criteria for the operator Th of the realizing system to be accretive. 7. 5. 5 is accretive if and only if ∞ α2 − α 0 dτ (t) + 1 ≥ 0. 16) is strict. In this case the exact value of angle φ can be calculated by the formula tan φ = α2 − ∞ dτ (t) t 0 ∞ α 0 dτt(t) +1 .

Case 2. Here we assume that 0 dτt(t) = ∞. This means that our function V (z) belongs to the class SL−1 0 (R, K) and b = ∞. V. R. Tsekanovski˘ı Figure 3. b = 2 and φ-sectorial if and only if α < 0. 17) that the exact value of the angle φ is then found from 1 tan φ = − . 37) α The latter implies that the restored operator Th is extremal if α = 0. This means that a function V (z) ∈ SL−1 0 (R, K) is realized by a system with an extremal operator Th if and only if ∞ V (z) = 0 1 1 − t−z t dτ (t). 38) On the other hand since α ≤ 0 the function V (z) is an inverse Stieltjes function of the class S0−1 (R).

R. Tsekanovski˘ı, “Realization theorems for operator-valued Rfunctions”, Oper. Theory Adv. , 98 (1997), 55–91. V. R. Tsekanovski˘ı, “On classes of realizable operator-valued Rfunctions”, Oper. Theory Adv. , 115 (2000), 85–112. V. Belyi, S. V. R. , 2002. V. R. , vol. 2, no. 2, (2008), pp. 265–296. , Triangular and Jordan Representations of Linear Operators, Amer. Math. , Providence, RI, 1971. S. S. Liv˘sic. Spectral analysis of non-selfadjoint operators and intermediate systems, Uspekhi Matem. Nauk, XIII, no.

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