## Abstract

The present paper is devoted to the existence of solutions for implicit first order differential systems with nonlocal conditions expressed by continuous linear functionals. The lack of complete continuity of the associated integral operators, due to the implicit form of the equations, is overcome by using Krasnoselskii’s fixed point theorem for the sum of two operators. Moreover, a vectorial version of Krasnoselskii’s theorem and the technique based on vector-valued norms and matrices having the spectral radius less than one are likely to allow the system nonlinearities to behave independently as much as possible. In addition, the connection between the support of the nonlocal conditions and the constants from the growth conditions is highlighted.

## Authors

**Octavia Bolojan (Nica)
**Babes-Bolyai University,Cluj-Napoca, Romania

**Radu Precup**

Babes-Bolyai University, Cluj-Napoca, Romania

## Keywords

first order differential system; implicit differential equation; nonlocal condition; fixed point; vector-valued norm; spectral radius of a matrix

## Paper coordinates

O. Bolojan (Nica), R. Precup, *Implicit first order differential systems with nonlocal conditions*, Electron. J. Qual. Theory Differ. Equ. 2014, no. 69, 1-13, https://doi.org/10.14232/ejqtde.2014.1.69

## About this paper

##### Journal

Electronic Journal of Qualitative Theory of Differential Equations

##### Publisher Name

##### Print ISSN

##### Online ISSN

HU ISSN 1417-3875

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