Aristóteles y las series causales infinitas en Física VII y VIII.

The aim of this paper is to show that we have at least two different arguments that prove the First Motor existence. Even though there are coincidences between Physics VII 1 and VIII 5, their arguments are not identical. Physics VII argue the impossibility of an infinite movement in a finite time and VIII 5 the necessity of a "principal" cause. [ABSTRACT FROM AUTHOR]