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'fragments/reports', 'Philosophy of Logic' and 'On the Nature of the Gods ('De natura deorum')'
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5. Theory of Logic / A. Overview of Logic / 2. History of Logic
18954
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Before the late 19th century logic was trivialised by not dealing with relations [Putnam]
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5. Theory of Logic / A. Overview of Logic / 5. First-Order Logic
18956
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Asserting first-order validity implicitly involves second-order reference to classes [Putnam]
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