Investigations into the Predicate Calculus

Oiva Ketonen, Sara Negri, Jan Von Plato

$33.95 $30.24

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English

College Publications
01 December 2022

Philosophy: logic; Mathematical logic

Summary
Details

Oiva Ketonen (1913--2000) was the closest to a student the creator of modern proof theory Gerhard Gentzen ever had. Their encounter took place in 1938--39 in Göttingen, with Ketonen hoping to receive a suitable topic for a doctoral dissertation and Gentzen instead deeply immersed in attempts at proving the consistency of analysis. Ketonen's thesis of 1944, his only work in logic, introduced what is today called the G3-sequent calculus. It is his best-known discovery, a sequent calculus for classical propositional logic the logical rules of which are all invertible. Few read his thesis, the results of which were instead made available through a long review by Paul Bernays. Ketonen's calculus is the basis of Evert Beth's tableau method and of the sequent calculi in Stephen Kleene's influential {\it Introduction to Metamathematics}. A second result was a sharpening of the midsequent theorem, by which the number of quantifier inferences with eigenvariables could be minimized. The existence of a weakest possible midsequent followed, in the sense that if any midsequent is derivable, a weakest one is. Turning this into a contrapositive, Ketonen found a purely syntactic method for proofs of underivability that he applied to affine plane geometry. His result, in modern terms, was a positive solution to the word problem for the universal fragment of plane affine geometry, with a syntactic proof of underivability of the parallel postulate from the rest of the affine axioms as a corollary.

By: Oiva Ketonen
Edited by: Sara Negri, Jan Von Plato
Imprint: College Publications
Dimensions: Height: 234mm, Width: 156mm, Spine: 8mm
Weight: 204g
ISBN: 9781848904071
ISBN 10: 184890407X
Pages: 140
Publication Date: 01 December 2022
Audience: General/trade , ELT Advanced
Format: Paperback
Publisher's Status: Active

PERHAPS A GIFT VOUCHER FOR MUM?: MOTHER'S DAY

Investigations into the Predicate Calculus

Oiva Ketonen, Sara Negri, Jan Von Plato

$33.95 $30.24

Paperback

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