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Ideas for
'Commentary on 'De Anima'', 'Letters to Leibniz' and 'Modal Logic within Counterfactual Logic'
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4. Formal Logic / D. Modal Logic ML / 3. Modal Logic Systems / h. System S5
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In S5 matters of possibility and necessity are non-contingent [Williamson]
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4. Formal Logic / D. Modal Logic ML / 7. Barcan Formula
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No one can conceive of a possible substance, apart from those which God has created [Arnauld]
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