Compossibility
Compossibility
Those things are compossible in Leibniz’s philosophy which are literally “co-possible,” i.e., which may exist together, which belong to the same possible world. Since metaphysical possibility means for Leibniz simply the absence of contradiction, two or more things are compossible if, and only if, their joint ascription to a single world involves no contradiction. All possible worlds are held by Leibniz to have general laws analogous to those of our own actual world. Compossibility for any set of things, consequently, involves their capacity to be brought under one and the same general system of laws. That this last provision is important follows from the fact that Leibniz affirmed all simple predicates to be compatible. — F.L.W.