An object must exist at a world in order to exemplify properties at that world — an object cannot be utterly absent from a world and yet have properties there (serious actualism).
Many actualists strongly agree, for the following reason: predicates express properties and relations. Hence, if a (1-place) predicate \(\pi\) is true of an individual \(a\) at a world \(w,\) it means that \(a\) exemplifies the property that \(\pi\) expresses at \(w\). But (these actualists continue) it is surely an undeniable metaphysical principle—dubbed serious actualism by Plantinga (1983)—that an object must exist, must be identical with something, in order to exemplify properties; an objec