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Existence and uniqueness of solutions to weakly singular integral-algebraic and integro-differential equations

Mikhail Bulatov, Pedro Lima, Ewa Weinmüller (2014)

Open Mathematics

We consider systems of integral-algebraic and integro-differential equations with weakly singular kernels. Although these problem classes are not in the focus of the main stream literature, they are interesting, not only in their own right, but also because they may arise from the analysis of certain classes of differential-algebraic systems of partial differential equations. In the first part of the paper, we deal with two-dimensional integral-algebraic equations. Next, we analyze Volterra integral...

Existence of periodic solutions for first-order totally nonlinear neutral differential equations with variable delay

Abdelouaheb Ardjouni, Ahcène Djoudi (2014)

Commentationes Mathematicae Universitatis Carolinae

We use a modification of Krasnoselskii’s fixed point theorem due to Burton (see [Liapunov functionals, fixed points and stability by Krasnoselskii’s theorem, Nonlinear Stud. 9 (2002), 181–190], Theorem 3) to show that the totally nonlinear neutral differential equation with variable delay x ' ( t ) = - a ( t ) h ( x ( t ) ) + c ( t ) x ' ( t - g ( t ) ) Q ' ( x ( t - g ( t ) ) ) + G ( t , x ( t ) , x ( t - g ( t ) ) ) , has a periodic solution. We invert this equation to construct a fixed point mapping expressed as a sum of two mappings such that one is compact and the other is a large contraction. We show that the mapping fits...

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