Introduzione
Abstract
En
We give a method to establish when the solution
of the semi-linear initial-value problem:
;
belongs to a closed cone Q of a Banach space X.
We give a method to establish when the solution


![t \in [0,T]](http://siba-ese.unisalento.it/plugins/generic/latexRender/cache/32bbd4a286ac4d26a80c9c10182eead0.png)

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