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An interval fixed point theorem
In this paper we will present an interval version to the Fixed Point Theorem. Such theorem offers a practical method (the 'sucessive ap proximations method') which serves to the interval fixed point equa tion root compute. We will also present a criterion that allows to de fine easily ~theinterval semi-plain regions which can hold such roots. Finally, we will do a practical application, showing in what manner to compute the polynomial interval function fixed points