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Ideas for 'fragments/reports', 'Problems of Knowledge' and 'The Metaphysics of Modality'

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2 ideas

5. Theory of Logic / A. Overview of Logic / 3. Value of Logic

3599	Deduction shows entailments, not what to believe [Williams,M]
	Full Idea: The rules of deduction are rules of entailment, not rules of inference. They tell us what follows from what, not what to believe on the basis of what.
	From: Michael Williams (Problems of Knowledge [2001], Ch.18)

5. Theory of Logic / E. Structures of Logic / 2. Logical Connectives / d. and

12010	Is the meaning of 'and' given by its truth table, or by its introduction and elimination rules? [Forbes,G]
	Full Idea: The typical semantic account of validity for propositional connectives like 'and' presupposes that meaning is given by truth-tables. On the natural deduction view, the meaning of 'and' is given by its introduction and elimination rules.
	From: Graeme Forbes (The Metaphysics of Modality [1985], 4.4)