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Ideas for 'Truth and the Past', 'Causation and Explanation' and 'Against the Ethicists (one book)'

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5. Theory of Logic / K. Features of Logics / 10. Monotonicity

4810	Valid deduction is monotonic - that is, it remains valid if further premises are added [Psillos]
	Full Idea: Valid deductive arguments have the property of monotonicity; if the conclusion Q follows from the premises P, then it will also follow if further premises P* are added to P.
	From: Stathis Psillos (Causation and Explanation [2002], §9.2.1)
	A reaction: For perversity's sake we could add a new premise which contradicted one of the original ones ('Socrates is a god'). Or one premise could be 'I believe..', and the new one could show that the belief was false. Induction is non-monotonic.