- Descartes
- # Descartes
René Descartes was a French philosopher and mathematician from the 1600s who fundamentally changed how people think about knowledge and the mind. He's famous for the idea "I think, therefore I am" (cogito ergo sum), which means that the very fact that you can think proves you exist—a foundation for modern philosophy. He also invented the coordinate system used in mathematics (the x and y axes on a graph), which connects geometry and algebra in practical ways we still use today.
- External place(as contrasted with internal place)
- In Descartes' theory, the outer boundary or surface of an object, especially where it touches or relates to other objects around it.
- Internal place(as contrasted with external place)
- In Descartes' theory, the physical material or substance itself—the 'stuff' that makes up an object.
- Pr II 15(as a source reference)
- A reference to Part II, Section 15 of Descartes' major work 'Principles of Philosophy'—like a citation showing where this idea appears.
- Reducible(as used in metaphysics and philosophy of mind)
- Able to be broken down or explained in terms of something simpler or more basic; for example, saying 'water' is reducible to hydrogen and oxygen.
- Spatial relations(as what Descartes is analyzing)
- The ways things are positioned in space relative to each other—like being above, below, next to, or far from something else.
- matter(Kant's critical epistemology, agreeing with Leibniz on this point)
- Not a thing in itself with mind-independent characteristics, but an appearance — objects as presented to human perception, characterized by shape, contact, and movement.