By Alexander Krasnoselskii, M. Martin

ISBN-10: 3034890826

ISBN-13: 9783034890823

ISBN-10: 3034898991

ISBN-13: 9783034898997

New tools for fixing classical difficulties within the idea of nonlinear operator equations (solvability, a number of strategies, bifurcations, nonlinear resonance, capability tools, and so forth) are brought and mentioned. the final summary theorems are illustrated by way of quite a few purposes to differential equations and boundary price difficulties. particularly, the matter on pressured periodic oscillations is taken into account for equations coming up up to the mark theory.

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Additional resources for Asymptotics of Nonlinearities and Operator Equations

Example text

We can now use M. A. Krasnoselskii's theorem on asymptotic bifurcation points (see again [Krasnoselskii, Zabreiko, 1975]). 11) for a certain k = k(p), such that k(p) ---4 A01 as p ---4 00. Consequently, k(p) E [0, kol for any sufficiently large p, and thus our claim is proved.

L+ 2H(lW }]. LD)~ [H(IW]::r [ 2M + tJi {(o2o) s,;. 'I~I' H(lW }] . 25) we get the estimate J Ig(t)lcp[t, Uo + 2Iee(t)lldfL:::;; n : :; 260-1 Ilg(t)llq [H(IW]::r -Iel- . 4 is complete. eo. §6. 1. SIGN-COMPATIBLE FAMILIES OF FUNCTIONS. We consider two compact (with respect to a certain norm) families ~o and ~1 of integrable functions. 1) for every e(t) E ~o. In other words, the family ~o is sign-compatible with ~1 provided that for any function in ~o there exists a sign-compatible with it function in ~1.

Clearly, P + Q = I, where I is the identity operator. The operators P and Q commute with the operator A. 3) hold true, where 0 < Al < Ao. 3) we get the inequality IIAII ~ Ao. 3) are fulfilled, for instance, if the operator A is normal and the subspace Eo is defined by the equality Eo = {x(t) : x(t) E L 2, IIAx(t)II = IIAII ·IIx(t)II}· 55 Solvability of equations In this case >'0 = IIAII and >'1 = max >-Ea(A); 1>-1#>-0 1>,1, where CJ(A) is the spectrum of A. We give yet another example. , the space L2 consists of scalarvalued functions.

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Asymptotics of Nonlinearities and Operator Equations by Alexander Krasnoselskii, M. Martin


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