Palamides, P.K.; Palamides, A.P.
(Нелінійні коливання, 2012)
In this paper, we prove the existence of three positive and concave solutions, by means of an elementary
simple approach, to the 2th order two-point boundary-value problem
x''(t) = α(t)f(t, x(t), x'(t)), 0 < t < 1, x(0) ...