Philosophy Lexicon of Arguments

Natural deduction, logic: is a calculus by Gerhard Gentzen (Gentzen, “Untersuchungen über das logische Schließen“. In Mathematische Zeitschrift Band 39, 1935, pp. 176–210, 405–431), which largely manages without axioms and instead works with introductory and eliminating rules for the operators used. Assumptions that are needed in the course of time can be partly eliminated later. See also axiomatization, axiom systems, axioms, inference.
Author Item Excerpt Meta data

Books on Amazon
I 143
Calculus of natural deduction / Gentzen / Geach: here there are "possible names" (> existence introduction) - but no quantification over them - GeachVsQuine: he can not treat names any more as"covert descriptions".

Gea I
P.T. Geach
Logic Matters Oxford 1972

> Counter arguments against Geach

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Ed. Martin Schulz, access date 2017-05-25