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Ideas for 'works', 'The Metaphysics of Scientific Realism' and 'The Logic of Decision'

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2 ideas

5. Theory of Logic / A. Overview of Logic / 1. Overview of Logic

12666	We can base logic on acceptability, and abandon the Fregean account by truth-preservation [Ellis]
	Full Idea: In logic, acceptability conditions can replace truth conditions, ..and the only price one has to pay for this is that one has to abandon the implausible Fregean idea that logic is the theory of truth preservation.
	From: Brian Ellis (The Metaphysics of Scientific Realism [2009], 1)
	A reaction: This has always struck me as correct, given that if you assign T and F in a semantics, they don't have to mean 'true' and 'false', and that you can do very good logic with propositions which you think are entirely false.

5. Theory of Logic / E. Structures of Logic / 2. Logical Connectives / c. not

21777	Negation of negation doubles back into a self-relationship [Hegel, by Houlgate]
	Full Idea: For Hegel, the 'negation of negation' is negation that, as it were, doubles back on itself and 'relates itself to itself'.
	From: report of Georg W.F.Hegel (works [1812]) by Stephen Houlgate - An Introduction to Hegel 6 'Space'
	A reaction: [ref VNP 1823 p.108] Glad we've cleared that one up.