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Results in Mathematics
Article . 1989 . Peer-reviewed
License: Springer TDM
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image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
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Extremal Solutions of Multivalued Differential Equations II

Extremal solutions of multivalued differential equations. II
Authors: Deimling, Klaus;

Extremal Solutions of Multivalued Differential Equations II

Abstract

Given a cone \(K\subset\mathbb{R}^ n\) and a set-valued differential equation \(\dot x\in F(t,x)\), \(t\in J=[0,a]\), the author wants to find an absolutely continuous solution which is minimal with respect to the ordering induced by \(K\). The assumptions on \(F\) are the following: (1) \(\| F(t,x)\|\leq c(t)(1+\| x\|)\), \(c\in L^ 1(J)\); (2) \(f(t,x)\in F(t,x)\subset f(t,x)+K\) where \(f\) is quasimonotone (i.e. \(f(t,x+y)\in f(t,x)+T_ K(y))\) with \(T_ K(y)=\{\lambda(z-y):\lambda\geq 0,z\in K\}\) for closed convex \(K\). The first result he shows is the following. Let \(D\subset X=\mathbb{R}^ n\) be closed and convex, \(F:J\times D\) into \(2^ X\) as in (1) above and such that \(F\) is compact-convex valued, measurable in \(t\), upper semicontinuous on \(x\). Assume also that \(F(t,x)\cap T_ D(x)\neq\emptyset\). Then the differential system has an absolutely continuous solution on \(J\) for every \(x_ 0\in D\). The previous result allows the author to prove the following very interesting comparison result. Let \(X=\mathbb{R}^ n\), \(K\neq\{0\}\) a cone of \(\mathbb{R}^ n\). Let \(F:J_ xX\to 2^ X\) as in the previous theorem (plus assumption (2)). If \(v:J\to X\) is absolutely continuous, \(v'\in F(t,v)+K\) a.e., \(v(0)\in x_ 0+K\), then \(x'\in F(t,x)\), \(x(0)=x_ 0\) has a solution \(x\leq v\) (i.e., \(v(t)\in x(t)+K\) on \(J)\). The author answers in the affirmative some open questions he posed in Part I[ibid. 14, No. 1-2, 38-47 (1988; Zbl 0655.34014)].

Keywords

extremal solutions, comparison result, set-valued differential equation, multivalued differential equations, cone, Ordinary differential inclusions

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
8
Average
Top 10%
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