Combining Texts

Ideas for 'Morality and Art', 'Review of Husserl's 'Phil of Arithmetic'' and 'Intensions Revisited'

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2 ideas

4. Formal Logic / B. Propositional Logic PL / 2. Tools of Propositional Logic / e. Axioms of PL

9585	Since every definition is an equation, one cannot define equality itself [Frege]

4. Formal Logic / D. Modal Logic ML / 1. Modal Logic

13591

Quantified modal logic collapses if essence is withdrawn [Quine]