Combining Texts

Ideas for 'Metaphysics', 'Truth and Truthmakers' and 'Symposium'

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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 / F. Set Theory ST / 1. Set Theory

18396

The set theory brackets { } assert that the member is a unit [Armstrong]

4. Formal Logic / F. Set Theory ST / 3. Types of Set / b. Empty (Null) Set

18393

For 'there is a class with no members' we don't need the null set as truthmaker [Armstrong]