Combining Philosophers

Ideas for Lynch,MP/Glasgow,JM, Stephen S. Colvin and Hilary Putnam

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2 ideas

5. Theory of Logic / A. Overview of Logic / 2. History of Logic

18954

Before the late 19th century logic was trivialised by not dealing with relations [Putnam]

5. Theory of Logic / A. Overview of Logic / 5. First-Order Logic

18956

Asserting first-order validity implicitly involves second-order reference to classes [Putnam]