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'works', 'An Introduction to Modal Logic' and 'Naturalism in Mathematics'
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5. Theory of Logic / E. Structures of Logic / 1. Logical Form
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'Propositional functions' are propositions with a variable as subject or predicate [Maddy]
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5. Theory of Logic / K. Features of Logics / 4. Completeness
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A system is 'weakly' complete if all wffs are derivable, and 'strongly' if theses are maximised [Hughes/Cresswell]
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