There is no convergence trouble here, but there may be commutativity trouble . 这里没有收敛性的麻烦，但可能有交换性的麻烦。
2.
Two commutativity theorem of semi - prime rings 关于半质环的两个交换性定理
3.
Study on condition of commutativity s - unital rings 单式环的变换条件
4.
Commutativity of associative rings which meets s , m , n center condition 中心条件的结合环之交换性
5.
The present paper presents a commutativity theorem of rings with identity 摘要给出有单位元的环的一个交换性定理。
6.
The rational spectrums of all kinds of virtual displacement definitions and commutativity of d , ? operations are given and testified in this paper . the research methods of intrinsical linear nonholonomic dynamics are similar to those of holonomic dynamics . the rationality and equivalence of chetaev model and vacco model in the intrinsical linear nonholonomic system are testified from the mathematic and mechanical aspects 本文研究了非完整动力学中使不定性问题确定化的交换关系和将非线性问题线性化的虚位移定义，首次证明并给出了在非完系统中各种虚位移定义与交换关系的合理适用范围，指出完整动力学与本质线性非完整动力学在研究方法上具有相同性。
