A generalized periodic boundary value problem for the one-dimensional p-Laplacian
Daqing Jiang, Junyu Wang · Annales Polonici Mathematici · 1997
The generalized periodic boundary value problem -[g(u')]' = f(t,u,u'), a < t < b, with u(a) = ξu(b) + c and u'(b) = ηu'(a) is studied by using the generalized method of upper and lower solutions, where ξ,η ≥ 0, a, b, c are given real numbers, $g(s) = |s|^