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Ideas for 'works', 'Introduction to the Theory of Logic' and 'On Carnap's Views on Ontology'

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2 ideas

5. Theory of Logic / E. Structures of Logic / 2. Logical Connectives / b. Basic connectives

10896	Propositional logic just needs ¬, and one of ∧, ∨ and → [Zalabardo]
	Full Idea: In propositional logic, any set containing ¬ and at least one of ∧, ∨ and → is expressively complete.
	From: José L. Zalabardo (Introduction to the Theory of Logic [2000], §2.8)

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.