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5 ideas

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

11175

Logical concepts rest on certain inferences, not on facts about implications [Fine,K]

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

8490	First-level functions have objects as arguments; second-level functions take functions as arguments [Frege]

5. Theory of Logic / E. Structures of Logic / 6. Relations in Logic

8492	Relations are functions with two arguments [Frege]

5. Theory of Logic / F. Referring in Logic / 3. Property (λ-) Abstraction

11176

The property of Property Abstraction says any suitable condition must imply a property [Fine,K]

5. Theory of Logic / I. Semantics of Logic / 3. Logical Truth

11174

A logical truth is true in virtue of the nature of the logical concepts [Fine,K]