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    • Keywords


      Upper solution; lower solution; order interval; truncation map; penalty function; Caratheodory function; Sobolev space; compact embedding; Dunford-Pettis theorem; Arzela-Ascoli theorem; extremal solution; periodic problem; Sturm-Liouville boundary conditions

    • Abstract


      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.

    • Author Affiliations


      Nikolaos S Papageorgiou1 Francesca Papalini2

      1. Department of Mathematics, National Technical University, Zografou Campus, Athens - 15780, Greece
      2. Department of Mathematics, University of Ancona, Via Brecce Bianche, Ancona - 60131, Italy
    • Dates

  • Proceedings – Mathematical Sciences | News

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