Combining Philosophers

Ideas for Empedocles, E.J. Lemmon and Ren Descartes

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2 ideas

5. Theory of Logic / B. Logical Consequence / 8. Material Implication

9520	The paradoxes of material implication are P |- Q → P, and ¬P |- P → Q [Lemmon]

5. Theory of Logic / C. Ontology of Logic / 3. If-Thenism

10054

Arithmetic and geometry achieve some certainty without worrying about existence [Descartes]