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International Journal of Stochastic Analysis

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International Journal of Stochastic Analysis / 1993 / Article

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Volume 6 |Article ID 756762 | https://doi.org/10.1155/S1048953393000279

S. Heikkilä, S. Leela, "On second order discontinuous differential equations in Banach spaces", International Journal of Stochastic Analysis, vol. 6, Article ID 756762, 21 pages, 1993. https://doi.org/10.1155/S1048953393000279

On second order discontinuous differential equations in Banach spaces

S. Heikkilä1 and S. Leela2

1University of Oulu, Department of Mathematics, Finland

2SUNY College at Geneseo, Department of Mathematics, USA

Received01 Sep 1993
Revised01 Dec 1993

Abstract

In this paper we study a second order semilinear initial value problem (IVP), where the linear operator in the differential equation is the infinitesimal generator of a strongly continuous cosine family in a Banach space E. We shall first prove existence, uniqueness and estimation results for weak solutions of the IVP with Carathéodory type of nonlinearity, by using a comparison method. The existence of the extremal mild solutions of the IVP is then studied when E is an ordered Banach space. We shall also discuss the dependence of these solutions on the data. A characteristic feature of the results concerning extremal solutions is that the nonlinearity is not assumed to be continuous in any of its arguments. Moreover, no compactness conditions are assumed. The obtained results are then applied to a second order partial differential equation of hyperbolic type.

Copyright © 1993 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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