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On the existence of solutions of nonlinear integral equations in Banach spaces and Henstock-Kurzweil integrals

100%
Sikorska-Nowak A.
Annales Polonici Mathematici
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2004
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tom 83
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nr 3
257-267
EN
We prove some existence theorems for nonlinear integral equations of the Urysohn type $x(t) = φ(t) + λ∫_0^a f(t,s,x(s))ds$ and Volterra type $x(t) = φ(t) + ∫_0^tf(t,s,x(s))ds$, $t ∈ I_a = [0,a]$, where f and φ are functions with values in Banach spaces. Our fundamental tools are: measures of noncompactness and properties of the Henstock-Kurzweil integral.
2
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Integro-differential equations on time scales with Henstock-Kurzweil delta integrals

100%
Sikorska-Nowak A.
Discussiones Mathematicae, Differential Inclusions, Control and Optimization
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2011
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tom 31
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nr 1
71-90
EN
In this paper we prove existence theorems for integro - differential equations $x^Δ (t) = f(t,x(t),∫₀^t k(t,s,x(s))Δs)$, t ∈ Iₐ = [0,a] ∩ T, a ∈ R₊, x(0) = x₀ where T denotes a time scale (nonempty closed subset of real numbers R), Iₐ is a time scale interval. Functions f,k are Carathéodory functions with values in a Banach space E and the integral is taken in the sense of Henstock-Kurzweil delta integral, which generalizes the Henstock-Kurzweil integral. Additionally, functions f and k satisfy some boundary conditions and conditions expressed in terms of measures of noncompactness. Moreover, we prove an Ambrosetti type lemma on a time scale.
3
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Existance of solutions of nonlinear integral equations and Henstock–Kurzweil integrals

100%
Sikorska-Nowak A.
Commentationes Mathematicae
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2007
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tom 47
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nr 2
EN
We prove an existence theorems for the nonlinear integral equation \[ x(t) = f (t) + \int_{0}^a k_1 (t, s)x(s)ds + \int_{0}^a k_2(t, s)g(s, x(s))ds,\quad t \in I_a = [0, a], a \in \mathbb{R} _+, \] where \(f, g, x\) are functions with values in Banach spaces. Our fundamental tools are: measures of noncompactness and properties of the Henstock-Kurzweil integral.
4
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Existence of solutions of the dynamic Cauchy problem on infinite time scale intervals

64%
Kubiaczyk I., Sikorska-Nowak A.
Discussiones Mathematicae, Differential Inclusions, Control and Optimization
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2009
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tom 29
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nr 1
113-126
EN
In the paper, we prove the existence of solutions and Carathéodory's type solutions of the dynamic Cauchy problem $x^Δ(t) = f(t,x(t))$, t ∈ T, x(0) = x₀, where T denotes an unbounded time scale (a nonempty closed subset of R and such that there exists a sequence (xₙ) in T and xₙ → ∞) and f is continuous or satisfies Carathéodory's conditions and some conditions expressed in terms of measures of noncompactness. The Sadovskii fixed point theorem and Ambrosetti's lemma are used to prove the main result. The results presented in the paper are new not only for Banach valued functions, but also for real-valued functions.
5
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Carathéodory solutions of Sturm-Liouville dynamic equation with a measure of noncompactness in Banach spaces

51%
Yantir A., Kubiaczyk I., Sikorska-Nowak A.
Open Mathematics
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2015
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tom 13
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nr 1
EN
In this paper, we present the existence result for Carathéodory type solutions for the nonlinear Sturm- Liouville boundary value problem (SLBVP) in Banach spaces on an arbitrary time scale. For this purpose, we introduce an equivalent integral operator to the SLBVP by means of Green’s function on an appropriate set. By imposing the regularity conditions expressed in terms of Kuratowski measure of noncompactness, we prove the existence of the fixed points of the equivalent integral operator. Mönch’s fixed point theorem is used to prove the main result. Finally, we also remark that it is straightforward to guarantee the existence of Carathéodory solutions for the SLBVP if Kuratowski measure of noncompactness is replaced by any axiomatic measure of noncompactness.
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