SOLVABILITY OF NON-LINEAR EQUATIONS AND BOUNDARY VALUE PROBLEMS
Abstract
THE EXISTENCE AND UNIQUENESS OF PERIODIC SOLUTIONS FOR A NON- LINEAR BOUNDARY VALUE PROBLEM INVOLVING A FOURTH-ORDER HYPERBOLIC EQUATION WITH DAMPING ARE STUDIED. MOREOVER, THE EXISTENCE OF PERIODIC SOLUTIONS IS STUDIED FOR A RELATED PROBLEM WITHOUT A DAMPING TERM. A NECESSARY AND SUFFICIENT CONDITION IS PROVIDED FOR THE SOLVABILITY OF AN OPERATOR EQUATION, WHERE THE LINEAR TERM IS GIVEN BY ASELF-ADJOINT, NON INVERTIBLE OPERATOR WITH A FINITE-DIMENSIONAL KERNEL, AND THE NON-LINEAR TERM BY A CONTINUOUS, GRADIENT OPERATOR. THIS CONDITION IS THEN APPLIED TO PROVE EXISTENCE AND MULTIPLICITY OF SOLUTIONS FOR A NON-LINEAR ELLIPTIC BOUNDARY VALUE PROBLEM AND FOR TWO NON LINEAR BOUNDARY VALUE PROBLEMS FOR ORDINARY DIFFERENTIAL EQUATIONS.
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