Multiple positive solutions for higher-order boundary value problems with sign changing nonlinearities Original Research Article

For the 2nth-order boundary value problem View the MathML source View the MathML source where f is allowed to change sign, Φ(v) = |v|p−2v, p > 1, growth conditions are imposed on f which yield the existence of at least two symmetric positive solutions by using the fixed-point theorem in double cones.