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'Protagoras', 'Philosophy of Chemistry' and 'Modality'
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2 ideas
5. Theory of Logic / G. Quantification / 5. Second-Order Quantification
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Second-order logic needs second-order variables and quantification into predicate position [Melia]
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5. Theory of Logic / J. Model Theory in Logic / 1. Logical Models
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If every model that makes premises true also makes conclusion true, the argument is valid [Melia]
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