Combining Philosophers

Ideas for H.Putnam/P.Oppenheim, Immanuel Kant and Cleanthes

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4. Formal Logic / B. Propositional Logic PL / 2. Tools of Propositional Logic / e. Axioms of PL
Philosophy has no axioms, as it is just rational cognition of concepts [Kant]
     Full Idea: Since philosophy is merely rational cognition in accordance with concepts, no principle is to be encountered in it that deserves the name of axiom.
     From: Immanuel Kant (Critique of Pure Reason [1781], B760/A732)
     A reaction: This is an attack on traditional rationalism, which aspires to do philosophy in the style of Euclid. Kant offers, however, a very conservative view, in which all concepts are 'given'. Nowadays we want to play with new axioms, as they did in geometry.