Annihilators of nilpotent elements

نویسنده

  • Abraham A. Klein
چکیده

For an element x of a ring R, let A (x), Ar(x), and A(x) denote, respectively, the left, right and two-sided annihilator of x in R. For a set X , we denote cardX by |X|; and say that a subset Y of X is large in X if |Y | = |X|. We prove that if x is any nilpotent element and I is any infinite ideal of R, then A(x) ∩ I is large in I , and in particular |A (x)| = |Ar(x)| = |A(x)| = |R|. The last result is applied to obtain a generalization of a result of Putcha and Yaqub [2] which shows that an infinite nonnil ring has infinitely many nonnilpotent elements. A short proof of their result is given in [1]. We prove a much stronger result showing that the set of nonnilpotent elements of a nonnil ring is at least as large as is its set of nilpotent elements. The following lemma is simple but crucial.

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عنوان ژورنال:
  • Int. J. Math. Mathematical Sciences

دوره 2005  شماره 

صفحات  -

تاریخ انتشار 2005