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On periodic solutions of systems of linear functional-differential equations

Ivan KiguradzeBedřich Půža — 1997

Archivum Mathematicum

This paper deals with the system of functional-differential equations d x ( t ) d t = p ( x ) ( t ) + q ( t ) , where p : C ω ( R n ) L ω ( R n ) is a linear bounded operator, q L ω ( R n ) , ω > 0 and C ω ( R n ) and L ω ( R n ) are spaces of n -dimensional ω -periodic vector functions with continuous and integrable on [ 0 , ω ] components, respectively. Conditions which guarantee the existence of a unique ω -periodic solution and continuous dependence of that solution on the right hand side of the system considered are established.

On the dimension of the solution set to the homogeneous linear functional differential equation of the first order

Alexander DomoshnitskyRobert HaklBedřich Půža — 2012

Czechoslovak Mathematical Journal

Consider the homogeneous equation u ' ( t ) = ( u ) ( t ) for a.e. t [ a , b ] where : C ( [ a , b ] ; ) L ( [ a , b ] ; ) is a linear bounded operator. The efficient conditions guaranteeing that the solution set to the equation considered is one-dimensional, generated by a positive monotone function, are established. The results obtained are applied to get new efficient conditions sufficient for the solvability of a class of boundary value problems for first order linear functional differential equations.

New optimal conditions for unique solvability of the Cauchy problem for first order linear functional differential equations

Robert HaklAlexander LomtatidzeBedřich Půža — 2002

Mathematica Bohemica

The nonimprovable sufficient conditions for the unique solvability of the problem u ' ( t ) = ( u ) ( t ) + q ( t ) , u ( a ) = c , where C ( I ; ) L ( I ; ) is a linear bounded operator, q L ( I ; ) , c , are established which are different from the previous results. More precisely, they are interesting especially in the case where the operator is not of Volterra’s type with respect to the point a .

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