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Investigations into the Predicate Calculus by Oiva Ketonen (2022, Trade Paperback)

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About this product

Product Identifiers

PublisherCollege Publications

ISBN-10184890407X

ISBN-139781848904071

eBay Product ID (ePID)7069264387

Product Key Features

Number of Pages140 Pages

LanguageEnglish

Publication NameInvestigations Into the Predicate Calculus

Publication Year2022

SubjectLogic

TypeTextbook

Subject AreaMathematics, Philosophy

AuthorOiva Ketonen

FormatTrade Paperback

Dimensions

Item Height0.3 in

Item Weight7.2 Oz

Item Length9.2 in

Item Width6.1 in

Additional Product Features

Intended AudienceTrade

SynopsisOiva 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.