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Filippov Lemma for certain second order differential inclusions
Authors:Grzegorz Bartuzel  Andrzej Fryszkowski
Institution:1. Faculty of Mathematics and Information Science, Warsaw University of Technology, Koszykowa 75, 00-662, Warsaw, Poland
Abstract:In the paper we give an analogue of the Filippov Lemma for the second order differential inclusions ></img>                                </span>                              </span> with the initial conditions <em>y</em>(0) = 0, <em>y</em>??(0) = 0, where the matrix <em>A</em> ?? ?<sup>                                <em>d</em>×<em>d</em>                              </sup> and multifunction <span class= ></img>                              </span> is Lipschitz continuous in <em>y</em> with a <em>t</em>-independent constant <em>l</em>. The main result is the following: Assume that <em>F</em> is measurable in <em>t</em> and integrably bounded. Let <em>y</em>                              <sub>0</sub> ?? <em>W</em>                              <sup>2,1</sup> be an arbitrary function fulfilling the above initial conditions and such that <span class= ></img>                                </span>                              </span> where <em>p</em>                              <sub>0</sub> ?? <em>L</em>                              <sup>1</sup>0, 1]. Then there exists a solution <em>y</em> ?? <em>W</em>                              <sup>2,1</sup> to the above differential inclusions such that a.e. in 0, 1], <span class= ></img>                                </span>                              </span>.</td>
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