On semi-simple radical classes
B. J. Gardner, Patrick N. Stewart · Bulletin of the Australian Mathematical Society · 1975
It has been incorrectly asserted that each non-trivial semi-simple radical class of associative rings is a variety defined by an equation of the form xn = x. In this paper we give, for each non-trivial semi-simple radical class of associative rings, a set of equations which does define that class as a variety.