|content1 = CartesianismRationalism Foundationalism Res cogitans " " Res extensa"
2.
For Descartes, the primary characteristic of matter is extension ( " res extensa " ), just as the primary characteristic of mind is thought ( " res cogitans " ).
3.
The first influential philosopher to discuss this question specifically was res cogitans ( the realm of thought ), in contrast to the domain of material things, which he called res extensa ( the realm of extension ).
4.
The treatise is based on the philosophy developed by Descartes in his previous works, especially the distinction between the body and the soul : the soul thinks ( " res cogitans " ) but is incorporeal, while the body is a physical ( " res extensa " ) but does not think and is primarily defined by its form and movement.
5.
Referring to two fundamental notions of Ren?Descartes, Hiley states that " if we can give up the assumption that space-time is absolutely necessary for describing physical processes, then it is possible to bring the two apparently separate domains of " res extensa " and " res cogitans " into one common domain ", and he adds that " by using the notion of process and its description by an algebraic structure, we have the beginnings of a descriptive form that will enable us to understand quantum processes and will also enable us to explore the relation between mind and matter in new ways ."
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