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UNDECIDABILITY OF THE FIRST ORDER THEORIES OF FREE NONCOMMUTATIVE LIE ALGEBRAS

Published online by Cambridge University Press:  23 October 2018

OLGA KHARLAMPOVICH  and
ALEXEI MYASNIKOV
OLGA KHARLAMPOVICH
Affiliation:
DEPARTMENT OF MATHEMATICS AND STATISTICS HUNTER COLLEGE, CUNY NEW YORK, NY 10065, USAE-mail: [email protected]
ALEXEI MYASNIKOV
Affiliation:
DEPARTMENT OF MATHEMATICAL SCIENCES STEVENS INSTITUTE OF TECHNOLOGY HOBOKEN, NJ 07030, USAE-mail: [email protected]
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Abstract

Let R be a commutative integral unital domain and L a free noncommutative Lie algebra over R. In this article we show that the ring R and its action on L are 0-interpretable in L, viewed as a ring with the standard ring language $+ , \cdot ,0$. Furthermore, if R has characteristic zero then we prove that the elementary theory $Th\left( L \right)$ of L in the standard ring language is undecidable. To do so we show that the arithmetic ${\Bbb N} = \langle {\Bbb N}, + , \cdot ,0\rangle $ is 0-interpretable in L. This implies that the theory of $Th\left( L \right)$ has the independence property. These results answer some old questions on model theory of free Lie algebras.

Keywords

03C60Lie algebraelementary theory
Type
Articles
Information
The Journal of Symbolic Logic , Volume 83 , Issue 3 , September 2018 , pp. 1204 - 1216
Copyright
Copyright © The Association for Symbolic Logic 2018 

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