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The Tarski Theorems and Elementary Equivalence of Group Rings

机译:Tarski定理和群环的基本等价

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The Tarski theorems, proved by Myasnikov and Kharlampovich and inde-pendently by Sela say that all nonabelian free groups satisfy the same first-order or elementary theory. Kharlampovich and Myasnikov also prove that the elementary theory of free groups is decidable. For a group ring they have proved that the first-order theory (in the language of ring theory) is not decidable and have studied equations over group rings, especially for torsion-free hyperbolic groups. In this note we examine and survey extensions of Tarksi-like results to the collection of group rings and examine relationships between the universal and elementary theories of the corresponding groups and rings and the corresponding universal theory of the formed group ring. To accomplish this we introduce different first-order languages with equality whose model classes are respectively groups, rings and group rings. We prove that if R[G] is elementarily equivalent to S[H] then simultaneously the group G is elementarily equivalent to the group H and the ring R is elementarily equivalent to the ring S with respect to the appropriate languages. Further if G is universally equivalent to a nonabelian free group F and R is universally equivalent to the integers Z then R[G] is universally equivalent to Z[F] again with respect to an ap-propriate language.
机译:由Myasnikov和Kharlampovich证明以及由Sela独立地证明的Tarski定理说,所有非阿贝尔自由族都满足相同的一阶或基本理论。 Kharlampovich和Myasnikov也证明了自由群体的基本理论是可以决定的。对于群环,他们已经证明一阶理论(用环论的语言)是不可决定的,并且已经研究了群环上的方程,尤其是对于无扭转双曲群。在本说明中,我们检查并调查了类似Tarksi的结果对群环的扩展,并研究了相应群和环的通用和基本理论与所形成群环的通用理论之间的关系。为此,我们引入了具有相等性的不同一阶语言,它们的模型类分别是组,环和组环。我们证明如果就适当的语言而言,如果R [G]基本上等同于S [H],则组G基本上等同于组H,并且环R基本上等同于环S。此外,如果G普遍等效于一个非阿贝尔自由群F,R普遍等效于整数Z,则相对于适当的语言,R [G]再次普遍等效于Z [F]。

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