Combining Texts

Ideas for 'Truthmakers', 'Set Theory and Its Philosophy' and 'Substances without Substrata'

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4 ideas

5. Theory of Logic / A. Overview of Logic / 7. Second-Order Logic

10704

We can formalize second-order formation rules, but not inference rules [Potter]

5. Theory of Logic / E. Structures of Logic / 2. Logical Connectives / a. Logical connectives

18489

Connectives link sentences without linking their meanings [MacBride]

5. Theory of Logic / E. Structures of Logic / 2. Logical Connectives / c. not

18476

'A is F' may not be positive ('is dead'), and 'A is not-F' may not be negative ('is not blind') [MacBride]

5. Theory of Logic / H. Proof Systems / 3. Proof from Assumptions

10703

Supposing axioms (rather than accepting them) give truths, but they are conditional [Potter]