An Introduction to Operator Polynomials by Prof. Leiba Rodman (auth.) PDF

By Prof. Leiba Rodman (auth.)

ISBN-10: 3034891520

ISBN-13: 9783034891523

ISBN-10: 3034899289

ISBN-13: 9783034899284

This ebook offers an creation to the trendy thought of polynomials whose coefficients are linear bounded operators in a Banach house - operator polynomials. This concept has its roots and purposes in partial differential equations, mechanics and linear structures, in addition to in sleek operator idea and linear algebra. during the last decade, new advances were made within the idea of operator polynomials in accordance with the spectral technique. the writer, in addition to different mathematicians, participated during this improvement, and plenty of of the new effects are mirrored during this monograph. it's a excitement to recognize support given to me through many mathematicians. First i need to thank my instructor and colleague, I. Gohberg, whose information has been valuable. all through decades, i've got labored wtih a number of mathematicians just about operator polynomials, and, for that reason, their principles have encouraged my view of the topic; those are I. Gohberg, M. A. Kaashoek, L. Lerer, C. V. M. van der Mee, P. Lancaster, ok. Clancey, M. Tismenetsky, D. A. Herrero, and A. C. M. Ran. the subsequent mathematicians gave me suggestion relating quite a few features of the e-book: I. Gohberg, M. A. Kaashoek, A. C. M. Ran, okay. Clancey, J. Rovnyak, H. Langer, P.

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Extra info for An Introduction to Operator Polynomials

Example text

5 27 Clearly. 4) coincides with the dimension of Ker L(X). for IX-Xol < El • where El > 0 is sufficiently small. 4) is an analytic function on X for IX-Xol < El . Let p be the largest size of a not identically zero minor of D(X). and let M(X) be some minor of D(X) of size p with M(X) • O. As M(X) is an analytic function of X. for some E. 0 < E ~ E1 • the punctured disc does not contain zeros of M(X). Then clearly dim Ker L(X) = n-p for all X in this punctured disc. and the auxilliary statement is proved.

Observe that the quotient L(Y)/t(Y) is a Banach algebra with the norm Ilx+t (Y ) II = inf IIX+KII • Ket(Y) The next observation is that AI-,(C) is invertible in L(Y)/t(Y) for all A e C (here I stands for the identify in the Banach algebra L(Y)/t(Y». Indeed, if A ¢ AO' then AI-C is invertible (in L(Y», and hence ,(AI-C) = AI-,(C) is invertible as well. In the case A = ~O' there is a compact (even finite rank) operator K E L(Y) such that AoI-C+K is invertible (because AOI-C is Fredholm with index zero).

LINEARIZATIONS 36 Chap. 1 Ex. 6. Prove that an inverse linearization is generally not unique up to similarity, even assuming that X is finite dimensional. Ex. 7. Let L(X) = X2 I+XB+C, where B,C E L(X) and C is an invertible operator such that C = 0 2 for some 0 operator 0 is necessarily invertible). Prove that E L(X) (the is a global linearization of L(A). Ex. 8. Given a linearization of L(X) with respect to 0, find a linearization for the polynomial L(A+a) with respect to the open set {A+a I A E O} (here a is a fixed complex number).

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