Investigations into the Predicate Calculus by Ketonen, Oiva
Investigations into the Predicate Calculus by Ketonen, Oiva

Investigations into the Predicate Calculus

Oiva Ketonen (1913--2000) was the closest to a student the creator of modern proof theory Gerhard Gentzen...
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$46.27 SGD
SKU: 9781848904071
Product Type: Books
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Author: Oiva Ketonen
Format: Paperback
Language: English
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Investigations into the Predicate Calculus by Ketonen, Oiva

Investigations into the Predicate Calculus

$46.27
Investigations into the Predicate Calculus by Ketonen, Oiva

Investigations into the Predicate Calculus

$46.27
Author: Oiva Ketonen
Format: Paperback
Language: English
Description

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.



Author: Oiva Ketonen
Publisher: College Publications
Published: 12/01/2022
Pages: 140
Binding Type: Paperback
Weight: 0.45lbs
Size: 9.21h x 6.14w x 0.30d
ISBN: 9781848904071

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