We consider the periodic problem for a 2nd order ODE with non-invertible linear part, and mild nonlinear dissipation term. The motivation for this study is a paper by Lazer [9]. We add a bounded restoring force g(u) and show that the sufficient condition (of Landesman-Lazer type) given in [9] still implies the existence of a periodic solution in our case. We also comment on some variants of the problem and on the existence of bounded solutions.
机构:
Institut für Mathematik I, Freie Universität Berlin, Arnimallee 2–6, BerlinInstitut für Mathematik I, Freie Universität Berlin, Arnimallee 2–6, Berlin
机构:
COMENIUS UNIV, FAC MATH & PHYS, DEPT MATH ANAL, CS-84215 BRATISLAVA, CZECHOSLOVAKIACOMENIUS UNIV, FAC MATH & PHYS, DEPT MATH ANAL, CS-84215 BRATISLAVA, CZECHOSLOVAKIA
RUDOLF, B
KUBACEK, Z
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机构:
COMENIUS UNIV, FAC MATH & PHYS, DEPT MATH ANAL, CS-84215 BRATISLAVA, CZECHOSLOVAKIACOMENIUS UNIV, FAC MATH & PHYS, DEPT MATH ANAL, CS-84215 BRATISLAVA, CZECHOSLOVAKIA