Positive solutions for parametric nonlinear periodic problems with competing nonlinearities
We consider a nonlinear periodic problem driven by a nonhomogeneous differential operator Heater Case Gasket plus an indefinite potential and a reaction having the competing effects of concave and convex terms.For the superlinear (concave) term we do not employ the usual in such cases Ambrosetti-Rabinowitz condition.Using variational methods togeth