The dualism of metaphysics and epistemology is not Descartes's way. For him, there is just an investigation of the nature of this or that cognitive relation. Following this approach, this chapter focuses mainly on the structural features of thinking-facts. It argues that for Descartes, various kinds of dependencies rein thinking (e.g., of the sun) — in all such (my, our) thinkings certain preconditions are required and certain invariants recur. The invariant-types can be separated into three categories: object-existence, subject-existence, and activity-occurrence.
Keywords: Descartes, thinking-facts, invariant types, object-existence, subject-existence, activity-occurrence