Combining Texts
Ideas for
'The Middle Works (15 vols, ed Boydston)', 'Naming and Necessity notes and addenda' and 'Modal Logics and Philosophy'
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5. Theory of Logic / B. Logical Consequence / 7. Strict Implication
7789
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Necessary implication is called 'strict implication'; if successful, it is called 'entailment' [Girle]
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5. Theory of Logic / H. Proof Systems / 5. Tableau Proof
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If an argument is invalid, a truth tree will indicate a counter-example [Girle]
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