We study the existence of positive periodic solutions of the equations
x(n)(t) − p(t)x(t) + μf(t, x(t), x'(t), . . . , x(n−1)(t)) = 0,
x(n)(t) + p(t)x(t) = μf(t, x(t), x'(t), . . . , x(n−1)(t)),
where n≥2, μ>0, p: (-∞,∞)→(0,∞) is continuous and 1–periodic, f is a continuous function and 1–periodic in the first variable and may take values of different signs. The Krasnosielski fixed point theorem on cone is used.
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Vol. 23 (2009)
Published: 2009-09-30
10.2478/amsil