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Ideas for 'fragments/reports', 'How to Russell a Frege-Church' and 'Investigations into Logical Deduction'

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5. Theory of Logic / F. Referring in Logic / 2. Descriptions / c. Theory of definite descriptions

11989	For Russell, expressions dependent on contingent circumstances must be eliminated [Kaplan]
	Full Idea: It is a tenet of Russell's theory that all expressions, and especially definite descriptions, whose denotation is dependent upon contingent circumstances must be eliminated.
	From: David Kaplan (How to Russell a Frege-Church [1975], II)

5. Theory of Logic / H. Proof Systems / 4. Natural Deduction

13832	Natural deduction shows the heart of reasoning (and sequent calculus is just a tool) [Gentzen, by Hacking]
	Full Idea: Gentzen thought that his natural deduction gets at the heart of logical reasoning, and used the sequent calculus only as a convenient tool for proving his chief results.
	From: report of Gerhard Gentzen (Investigations into Logical Deduction [1935]) by Ian Hacking - What is Logic? §05