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Tarski on "Essentially Richer" Metalanguages

David DeVidi and Graham Solomon
Journal of Philosophical Logic
Vol. 28, No. 1 (Feb., 1999), pp. 1-28
Published by: Springer
Stable URL: http://www.jstor.org/stable/30227106
Page Count: 28
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Tarski on
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Abstract

It is well known that Tarski proved a result which can be stated roughly as: no sufficiently rich, consistent, classical language can contain its own truth definition. Tarski's way around this problem is to deal with two languages at a time, an object language for which we are defining truth and a metalanguage in which the definition occurs. An obvious question then is: under what conditions can we construct a definition of truth for a given object language. Tarski claims that it is necessary and sufficient that the metalanguage be "essentially richer". Our contention, put bluntly, is that this claim deserves more scrutiny from philosophers than it usually gets and in fact is false unless "essentially richer" means nothing else than "sufficient to contain a truth definition for the object language."

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