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Uncountably many solutions of a system of third order nonlinear differential equations

Min Liu — 2011

Commentationes Mathematicae Universitatis Carolinae

In this paper, we aim to study the global solvability of the following system of third order nonlinear neutral delay differential equations d d t r i ( t ) d d t λ i ( t ) d d t x i ( t ) - f i ( t , x 1 ( t - σ i 1 ) , x 2 ( t - σ i 2 ) , x 3 ( t - σ i 3 ) ) + d d t r i ( t ) d d t g i ( t , x 1 ( p i 1 ( t ) ) , x 2 ( p i 2 ( t ) ) , x 3 ( p i 3 ( t ) ) ) + d d t h i ( t , x 1 ( q i 1 ( t ) ) , x 2 ( q i 2 ( t ) ) , x 3 ( q i 3 ( t ) ) ) = l i ( t , x 1 ( η i 1 ( t ) ) , x 2 ( η i 2 ( t ) ) , x 3 ( η i 3 ( t ) ) ) , t t 0 , i { 1 , 2 , 3 } in the following bounded closed and convex set Ω ( a , b ) = x ( t ) = ( x 1 ( t ) , x 2 ( t ) , x 3 ( t ) ) C ( [ t 0 , + ) , 3 ) : a ( t ) x i ( t ) b ( t ) , t t 0 , i { 1 , 2 , 3 } , where σ i j > 0 , r i , λ i , a , b C ( [ t 0 , + ) , + ) , f i , g i , h i , l i C ( [ t 0 , + ) × 3 , ) , p i j , q i j , η i j C ( [ t 0 , + ) , ) for i , j { 1 , 2 , 3 } . By applying the Krasnoselskii fixed point theorem, the Schauder fixed point theorem, the Sadovskii fixed point theorem and the Banach contraction principle, four existence results of uncountably many bounded positive solutions of the system are established.

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