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Ideas for 'fragments/reports', 'Modality' and 'Towards a Critique of Hegel's Philosophy'

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2 ideas

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