Geodesic
Automorphisms and model-theory questions for nilpotent matrix groups and rings
Fundamentalʹnaâ i prikladnaâ matematika, Tome 14 (2008) no. 8, pp. 159-168.

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Let $R'=\mathrm{NT}(m, S)$. The purpose of the paper is the investigation of elementary equivalences $\mathrm{UT}(n,K)\equiv\mathrm{UT}(m,S)$ and $\Lambda(R)\equiv\Lambda(R')$ for arbitrary associative coefficient rings with identity. The main theorem gives the description of such equivalences for $n>4$. In addition, we investigate isomorphisms and elementary equivalence of Jordan niltriangular matrix rings. 
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V. M. Levchuk; E. V. Minakova. Automorphisms and model-theory questions for nilpotent matrix groups and rings. Fundamentalʹnaâ i prikladnaâ matematika, Tome 14 (2008) no. 8, pp. 159-168. http://geodesic.mathdoc.fr/item/FPM_2008_14_8_a9/

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