• Francesca Papalini

      Articles written in Proceedings – Mathematical Sciences

    • Periodic and boundary value problems for second order differential equations

      Nikolaos S Papageorgiou Francesca Papalini

      More Details Abstract Fulltext PDF

      In this paper we study second order scalar differential equations with Sturm-Liouville and periodic boundary conditions. The vector fieldf(t,x,y) is Caratheodory and in some instances the continuity condition onx ory is replaced by a monotonicity type hypothesis. Using the method of upper and lower solutions as well as truncation and penalization techniques, we show the existence of solutions and extremal solutions in the order interval determined by the upper and lower solutions. Also we establish some properties of the solutions and of the set they form.

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