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Elementary properties of free groups

By George S. Sacerdote

Abstract

ABSTRACT. In this paper we show that several classes of elementary properties (properties definable by sentences of a first order logic) of groups hold for all nonabelian free groups. These results are obtained by examining special embeddings of these groups into one another which preserve the properties in question. I. It has long been conjectured that the finitely generated nonabelian free groups are elementarily equivalent. (That is, they satisfy the same sentences of first order group theory.) The truth of this conjecture would yield the elementary equivalence of all of the nonabelian free groups. There have been several partial results in this area. The most notable are (') (1) (Oral tradition) All nonabelian free groups satisfy the same IL sentences; (2) (Merzlyakov's Theorem) If m> m '> 2 ate integers, then a positive sentence <D in the language of F / (the free group of rank m') holds in F (under the standard embedding) if and only if it holds in Fm" In this paper we shall apply the graph-theoretic techniques of small cancellatio

Year: 1973
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