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BOUNDEDNESS OF A CLASS OF NONLINEAR SECONDORDER FUNCTIONAL DIFFERENTIAL EQUATIONS

摘要

In his article 'Boundedness of a Class of Second-order Ordinary Differential Equations With Delay', Wen Lizhi has demonstrated the criterion of the boundedness of solutions of the equation (r(t)y’)’+a(t)y+b(t)f(y(t-ι(t)))=p(t) (cf. Kexue Tongbao,30(1985), 1045). In this letter, we discuss the boundedness of solutions of the secondorder nonlinear functional differential

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