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
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The paradoxes of material implication are P |- Q → P, and ¬P |- P → Q [Lemmon]
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5. Theory of Logic / C. Ontology of Logic / 3. If-Thenism
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Arithmetic and geometry achieve some certainty without worrying about existence [Descartes]
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