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Zbl 1064.34009
Atici, F.Merdivenci; Biles, D.C.
First order dynamic inclusions on time scales. (English)
[J] J. Math. Anal. Appl. 292, No. 1, 222-237 (2004). ISSN 0022-247X

The authors deal with the multi-valued boundary value problem $$y^\nabla(t)\in F(t, y(t))\quad\text{a.e. on }[a, b]_x,\qquad L(y(a), y(b))= 0,\tag1$$ on a time scale $\bbfT$, where $[a,b]_x= \{t\in\bbfT\mid a\le t\le b\}$, $F: [a,b]_x\times \bbfR\to \bbfR\setminus\{0\}$ is a multi-valued map with compact and convex values and $L: \bbfR^2\to \bbfR^2$ is a continuous single-valued map. The proof for the existence of a solution of (1) is based on the method of upper and lower solutions. The authors present some examples to illustrate that if one replaces the $\nabla$-derivative by the $\Delta$-derivative in the dynamic inclusion (1) then such a result holds only under more restrictive assumptions on $F$.
[Messoud A. Efendiev (Berlin)]

MSC 2000:: *34A60 ODE with multivalued right-hand sides
34B15 Nonlinear boundary value problems of ODE
34A45 Theoretical approximation of solutions of ODE

Keywords: upper and lower solutions; time scales; dynamic inclusions; boundary value problems; existence of solutions

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