Abstract

As far as existence of enduring subjects of change is concerned, Roman Ingarden's substance ontology stands in direct opposition to Whitehead's process metaphysics. However, with regard to domain of necessary relations, both systems are deeply platonic. Thus in this paper I pursue towards revealing some parallels and differences between both systems regarding views on ideal entities, necessary relations and pure possibilities. I examine whether having assumed contrary concepts of reality (substantial/procesual) both philosophers are forced to accept diverse conclusions in respect to ideal entities domain. I also point out some crucial problems that are to be found in both systems: what is the ground of necessary relations – is it a nature of so called ideal qualities, or is it content of ideas (Ingarden); is it an individual or a relational essence of eternal objects, so called "primordial nature of God", or evolving actuality (Whitehead). Finally I investigate whether points of convergence between both concepts could serve as a basis for some modifications to overcome relevant problems.