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ON SUPERNILPOTENT RADICALS WITH THE AMITSUR PROPERTY

Part of: Radicals and radical properties of rings

Published online by Cambridge University Press:  29 June 2009

HALINA FRANCE-JACKSON
HALINA FRANCE-JACKSON*
Affiliation:
Department of Mathematics and Applied Mathematics, Summerstrand Campus (South), Nelson Mandela Metropolitan University, PO Box 77000, Port Elizabeth 6031, South Africa (email: cbf@easterncape.co.uk)
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Abstract

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A radical α has the Amitsur property if α(A[x])=(α(A[x])∩A)[x] for all rings A. For rings R⊆S with the same unity, we call S a finite centralizing extension of R if there exist b1,b2,…,bt∈S such that S=b1R+b2R+⋯+btR and bir=rbi for all r∈R and i=1,2,…,t. A radical α is FCE-friendly if α(S)∩R⊆α(R) for any finite centralizing extension S of a ring R. We show that if α is a supernilpotent radical whose semisimple class contains the ring ℤ of all integers and α is FCE-friendly, then α has the Amitsur property. In this way the Amitsur property of many well-known radicals such as the prime radical, the Jacobson radical, the Brown–McCoy radical, the antisimple radical and the Behrens radical can be established. Moreover, applying this condition, we will show that the upper radical 𝒰(*k) generated by the essential cover *k of the class * of all *-rings has the Amitsur property and 𝒰(*k)(A[x])=𝒰(*k)(A)[x], where a semiprime ring R is called a *-ring if the factor ring R/I is prime radical for every nonzero ideal I of R. The importance of *-rings stems from the fact that a *-ring A is Jacobson semisimple if and only if A is a primitive ring.

Keywords

Amitsur property of radicalspolynomial ringsfinite centralizing extensionprime radicalessential coverspecial classspecial and supernilpotent radicals*-ringsprime heartpseudo radical

MSC classification

Secondary: 16N80: General radicals and rings
Type
Research Article
Information
Bulletin of the Australian Mathematical Society , Volume 80 , Issue 3 , December 2009 , pp. 423 - 429
Copyright
Copyright © Australian Mathematical Publishing Association Inc. 2009

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