Abstract Sufficient conditions for the existence of periodic, bounded, and unbounded solutions of the equation u ′′ = f ( t , u ) {u^{\prime\prime}=f(t,u)} are proved. Click to show full abstract
Abstract Sufficient conditions for the existence of periodic, bounded, and unbounded solutions of the equation u ′′ = f ( t , u ) {u^{\prime\prime}=f(t,u)} are proved.
               
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