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We prove some existence theorems for the Cauchy problemx′(t)=f(t,x(t)),x(0)=x0,t∈I=[0,α],using different types of integrals and its properties. The requirements on the function f are depended on types of solutions, and as possible as, close to necessary conditions. We present a brief survey of classes of solutions and we give some comparison results for them.
In this paper we prove a theorem for the existence of pseudo-solutions to the Cauchy problem, x' = f(t,x), x(0) = x₀ in Banach spaces. The function f will be assumed Pettis-integrable, but this assumption is not sufficient for the existence of solutions. We impose a weak compactness type condition expressed in terms of measures of weak noncompactness. We show that under some additionally assumptions...
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