Top 10 Philosophical Theories and Concepts Proposed by Philosophers

The Top Ten
1 "Cogito, ergo sum" (I think, therefore I am) - Rene Descartes
2 Theory of Forms - Plato
3 Categorical Imperative - Immanuel Kant
4 The Theory of Being and Non-Being - Parmenides
5 Socratic Method - Socrates
6 Four Causes - Aristotle
7 Atomism - Democritus and Leucippus
8 Hume's Causation - David Hume
9 The City of God - St. Augustine
10 Labor Theory of Value - Karl Marx
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