Using actions of free monoids and free associative algebras, we establish some Schreier-type formulas involving ranks of......

对任意可迁G-集A,讨论了G-分次环与A的Smash Products,定义并研究了G-分次环与G-集的Smash Products,推广了关于分次迹,余迹的Smas......

利用有限秩自由R-模V与一个G-集Ω构造出一个G-模VΩ，并给出了由它定义的特征标的计算公式，我们的结果是置换模R[Ω]定义的特征标的......

is the disjoint union of for all , where is the set of all roots of primitive second degree equations , with reduced dis......