Combining Texts

Ideas for 'Axiomatic Theories of Truth (2005 ver)', 'The Metaphysics of Modality' and 'Logical Necessity'

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3 ideas

4. Formal Logic / B. Propositional Logic PL / 2. Tools of Propositional Logic / a. Symbols of PL

12005

The symbol 'ι' forms definite descriptions; (ιx)F(x) says 'the x which is such that F(x)' [Forbes,G]

4. Formal Logic / D. Modal Logic ML / 3. Modal Logic Systems / h. System S5

12204

The logic of metaphysical necessity is S5 [Rumfitt]

4. Formal Logic / F. Set Theory ST / 1. Set Theory

15657

To prove the consistency of set theory, we must go beyond set theory [Halbach]