In this first volume of One and Many, Halper argues that books Alpha to Delta should be read as a coherent treatment, within the larger whole of the Metaphysics, which addresses the problem of how there can be a single science of metaphysics. Halper shows that Aristotle poses and pursues the problem of the existence of metaphysics as a version of the problem of the one and the many, which he resolves by introducing doctrines of being and substance.