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Ideas for 'Set Theory', ''Ostrich Nominalism' or 'Mirage Realism'?' and 'An Introduction to Modal Logic'

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5. Theory of Logic / K. Features of Logics / 4. Completeness

9544	A system is 'weakly' complete if all wffs are derivable, and 'strongly' if theses are maximised [Hughes/Cresswell]