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Some quadratic integral inequalities of Opial type

100%

Kuchta M.

nr 2

103-113

We derive and investigate integral inequalities of Opial type: $∫_I s|hḣ|dt ≤ ∫_I rḣ² dt$, where h ∈ H, I = (α,β) is any interval on the real line, H is a class of absolutely continuous functions h satisfying h(α) = 0 or h(β) = 0. Our method is a generalization of the method of [3]-[5]. Given the function r we determine the class of functions s for which quadratic integral inequalities of Opial type hold. Such classes have hitherto been described as the classes of solutions of a certain differential equation. In this paper a wider class of functions s is given which is the set of solutions of a certain differential inequality. This class is determined directly and some new inequalities are found.

Some perturbed inequalities of Ostrowski type for high-order differentiable functions and applications

80%

Erden S. , Sarikaya M. Z.

tom Vol. 27, nr 1

57--64

We firstly establish inequalities for functionswhose high degree derivatives are convex via an equality which was presented previously. Then we derive inequalities for functions whose high-order derivatives are absolutely continuous by using the same equality. In addition,we examine connections between inequalities obtained in earlierworks and our results. Finally, some estimates of composite quadrature rules are given.