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Ideas for 'Metaphysics', 'Begriffsschrift' and 'Formal and Material Consequence'

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4 ideas

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

573	The axioms of mathematics are part of philosophy [Aristotle]

562	Axioms are the underlying principles of everything, and who but the philosopher can assess their truth? [Aristotle]

4. Formal Logic / C. Predicate Calculus PC / 1. Predicate Calculus PC

4971	I don't use 'subject' and 'predicate' in my way of representing a judgement [Frege]

4. Formal Logic / C. Predicate Calculus PC / 2. Tools of Predicate Calculus / d. Universal quantifier ∀

17745

For Frege, 'All A's are B's' means that the concept A implies the concept B [Frege, by Walicki]