Caratheodory's solution of the Cauchy problem and question Z.Grande

preprint2015arXivOpen access

Abstract

It is shown that for a function f:R2→Rf:\mathbb R^2\to \mathbb R which is measurable with respect to the first variable and upper semicontinuous quasicontinuous and increasing with respect to the second variable there exists a Caratheodory's solution y(x)=y0+∫x0xf(t,y(t))dμ(t)y(x)=y_0+\int\limits_{x_0}^xf(t,y(t))dμ(t) of the Cauchy problem y′(x)=f(x,y(x))y'(x)=f(x,y(x)) with the initial condition y(x0)=y0y(x_0)=y_0. There are constructed examples which indicate to essentiality of condition of increasing and give the negative answer to a question of Z.~Grande.

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