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Ideas for 'The Evolution of Logic', 'The Correspondence Theory of Truth' and 'Necessary Beings'

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2 ideas

5. Theory of Logic / A. Overview of Logic / 4. Pure Logic

3746	Logic seems to work for unasserted sentences [O'Connor]

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

19296

If second-order variables range over sets, those are just objects; properties and relations aren't sets [Hale]