Combining Texts

Ideas for 'Substance and Individuation in Leibniz', 'Logic for Philosophy' and 'Gentzen's Analysis of First-Order Proofs'

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3 ideas

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

13825

Natural deduction introduction rules may represent 'definitions' of logical connectives [Prawitz]

5. Theory of Logic / E. Structures of Logic / 4. Variables in Logic

13696

When a variable is 'free' of the quantifier, the result seems incapable of truth or falsity [Sider]

5. Theory of Logic / E. Structures of Logic / 5. Functions in Logic

13700

A 'total' function must always produce an output for a given domain [Sider]