Strict proper nilness modulo an absorber
作者:
Kevin McCrimmon,
期刊:
Communications in Algebra
(Taylor Available online 1999)
卷期:
Volume 27,
issue 7
页码: 3067-3091
ISSN:0092-7872
年代: 1999
DOI:10.1080/00927879908826611
出版商: Gordon and Breach Science Publishers Ltd.
数据来源: Taylor
摘要:
An elementzof a Jordan systemJis strictly properly nilpotent if it is nilpotent in all homotopes of all extensions ofJ; it is strictly properly nilpotent of bounded index if there is a bound on its indices of nilpotence in all these extensions. We showed in a previous paper that the strictly properly nilpotent elements (resp. those of bounded index) form an ideal, by exhibiting that ideal as an Amitsur shrinkage. In this paper we prove by combinatorial methods (the exponential law for power series and Jordan Binomial Theorems) a modular generalization of this: the elements strictly properly nilpotent (resp. boundedly so) modulo the absorberQof an inner idealKform an ideal. As a corollary we obtain Zelmanov’s Nilness-mod-the-Absorber-Theorem that the ideal generated byQis nil modK. From this we re-derive his Primitive Absorber and Exceptional Heart Theorems (improved to show the heart isS(J), not justS( (J)3), two results crucial to the structure of primitive Jordan systems, using a triple-system version of Zelmanov's KKT-specialization for inner ideals in a Jordan pair.
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