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On the uniqueness of positive solutions for two-point boundary value problems of Emden-Fowler differential equations

Satoshi Tanaka (2010)

Mathematica Bohemica

The two-point boundary value problem u ' ' + h ( x ) u p = 0 , a < x < b , u ( a ) = u ( b ) = 0 is considered, where p > 1 , h C 1 [ 0 , 1 ] and h ( x ) > 0 for a x b . The existence of positive solutions is well-known. Several sufficient conditions have been obtained for the uniqueness of positive solutions. On the other hand, a non-uniqueness example was given by Moore and Nehari in 1959. In this paper, new uniqueness results are presented.

On the Vallée-Poussin problem for singular differential equations with deviating arguments

Ivan Kiguradze, Bedřich Půža (1997)

Archivum Mathematicum

For the differential equation u ( n ) ( t ) = f ( t , u ( τ 1 ( t ) ) , , u ( n - 1 ) ( τ n ( t ) ) ) , where the vector function f : ] a , b [ × R k n R k has nonintegrable singularities with respect to the first argument, sufficient conditions for existence and uniqueness of the Vallée–Poussin problem are established.

On the worst scenario method: a modified convergence theorem and its application to an uncertain differential equation

Petr Harasim (2008)

Applications of Mathematics

We propose a theoretical framework for solving a class of worst scenario problems. The existence of the worst scenario is proved through the convergence of a sequence of approximate worst scenarios. The main convergence theorem modifies and corrects the relevant results already published in literature. The theoretical framework is applied to a particular problem with an uncertain boundary value problem for a nonlinear ordinary differential equation with an uncertain coefficient.

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