The notion of normal elements for finite fields extension was generalized as k-normal elements by Huczynska et al.(2013)......

为探究吕家坨井田地质构造格局,根据钻孔勘探资料,采用分形理论和趋势面分析方法,研究了井田7......

For an integer n≥2, we say that an operator A is an n-idempotent if An = A; A is a generalized n-idempotent if An = A*;......

Sernirings which are a disjoint union of rings form a variety S which contains the variety of all rings and the variety ......

. Let Tn be the algebra of all n × n complex upper triangular matrices. We give the concrete forms of linear injective ......

一个元素叫做右单位 J‐clean（左单位 J‐clean）如果在 R中存在一个单位u ，使得 au（ua）是 J‐clean的。一个环R叫做右单位J‐clean（左单......