A: The problem of freedom arises naturally when the reason human seeks to unify the various elements of its representation of the world. Indeed, if the explanation includes the philosophical reality in its entirety, at least ideally (and unlike the sciences that have only part of the world to object), then an effort to unify our knowledge by a single causality is due , and in order to avoid the contradictions arising from the assumption of the existence of multiple causalities (mental and physical): indeed it seems impossible to think of the interaction of two heterogeneous causalities (Hunter, ...