Combining Philosophers

Ideas for Hermarchus, D.J. O'Connor and Peter Smith

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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

10616

Second-order arithmetic can prove new sentences of first-order [Smith,P]