A Note on Varieties of Semiprime Rings with Semigroup Identities
View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by Elsevier - Publisher Connector JOURNAL OF ALGEBRA 54, 42-45 (1978) A Note on Varieties of Semiprime Rings with Semigroup Identities IGOR Z. GOLUBCHIK AND ALEXANDER MIKHALEV Department of Mechanics and Mathematics, Moscow State University, Moscow V-234, USSR Communicated by A. W. Goldie Received November 14. 1977 Let o(x, ,..., xk) and u(xr ,..., xk) be any monomials, f(x, ,..., x~) = @I ,**., Xt) - u(q >..., xk), and degf the total degree of f(zl ,..., xk). A poly- nomial identityf(x, ,..., x~) = 0 will be called a semigroup identity. Examples of rings with semigroup identities. (1) R is a commutative ring. Then we take f(xl , ~a) = xi.‘cz - x.~x, . (2) R is a finite ring. Indeed (see, for instance, [5]), let I R j = r < 03. Consider fi : R -+ R, i = I,2 ,..., given by fi(a) = ui for all a E R. We have no more than F-I distinct maps fi . So fit = fi for some I < K. Thus ux- = a2 for all a E R and we take f(x) = .G’ - 9. We remark that varieties of the form var(R), where R is a finite ring, were described in many ways among all other varieties of rings by Lvov [5, 61 and Kruse [7]. Our main result is the following THEOREM. Let R be a semiprime associative ring with a semigroup identity. Denote the variety of R by var(R). Then var(R) = var(A @ B), where A is a finite ring and B is a commutative ring.
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