By Alpay D., Vinnikov V. (Ed)

This quantity comprises six peer-refereed articles written at the social gathering of the workshop Operator idea, approach thought and scattering idea: multidimensional generalizations and comparable subject matters, held on the division of arithmetic of the Ben-Gurion collage of the Negev in the course of the interval June 26-July 1, 2005. The papers current the latest advancements in key instructions of present study in advanced research and operator concept. issues thought of contain Schur research, hierarchical semiseparable matrices, canonical kinds for pairs of quaternionic matrices, the idea of homogeneous operators, algebras of fractions of constant capabilities, and second difficulties. Schur research in its a variety of points occupies greater than half the quantity, and moments difficulties have additionally an enormous position within the papers provided here.The quantity might be of curiosity to a large viewers of natural and utilized mathematicians, electric engineers and theoretical physicists.

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Alpay, A. Dijksma and H. 16. Let Θ(z) be a rational p × p matrix function which is J-unitary on R, and assume that Θ(z) does not have any poles in the closed upper half-plane. 17. Let z1 ∈ T (∈ R ∪ {∞}, respectively) and let Θ(z) be a normalized element in Ucz1 (in U z1 , respectively). Then Θ(z) admits a unique minimal factorization into normalized elementary factors. Proof. 15 we consider the line case and z1 ∈ R. We show that the space P(Θ) is spanned by the elements of only one chain. Suppose, on the contrary, that it is spanned by the elements of more than one chain.

0 ν0 ν1 ν2 .. 0 0 ν0 ν1 .. 0 0 0 ν0 .. ⎞ ··· · · ·⎟ ⎟ · · ·⎟ ⎟. · · ·⎟ ⎠ .. 4, that is, the smallest positive integer k0 = k0 (Γ) such that for n(z) ∈ N the principal submatrix Γk0 is invertible. 9. For the function n(z) ∈ Nz1 which is not identically equal to a real constant and its Pick matrix Γ at z1 we have Im ν0 = 0 ⇐⇒ k0 (Γ) = 1; if ν0 ∈ R and k is the smallest integer ≥ 1 such that νk = 0, then k0 (Γ) = 2k. The Transformation of Issai Schur 49 Proof. The ﬁrst statement follows from the formula Γ1 = γ00 = Im ν0 /Im z1 .

11. Let J be a p × p signature matrix and let Θ(z) be a rational p × p matrix function which is J-unitary on the unit circle and has no poles on the closed unit disk. Then P(Θ) = H2,J ΘH2,J . The McMillan degree is invariant under M¨ obius transformations, see [37]. 6. 12. Let Θ(z) be a rational p × p matrix function which is J-unitary on the unit circle and has a unique pole at the point 1/w∗ including, possibly, w = 0. Then deg Θ z−w , det Θ(z) = c 1 − zw∗ where c is a unimodular constant. In the sequel we shall need only the case p = 2.