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arXiv 0710.0065math.RA
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代数交叉积的交换性与理想

Commutativity and ideals in algebraic crossed products

Johan Oinert, Sergei D. Silvestrov

摘要:

我们研究了任意群作用的非交换代数交叉积中的交换子环和理想的性质。给出了叉积环中基系数子环的交换子的刻划。利用交积环与基子环的作用和交理想给出了基子环的交换子的交换性和极大交换性的条件,特别考虑了基环无非平凡零因子和基环有非平凡零因子的情况.

英文摘要:

We investigate properties of commutative subrings and ideals in non-commutative algebraic crossed products for actions by arbitrary groups. A description of the commutant of the base coefficient subring in the crossed product ring is given. Conditions for commutativity and maximal commutativity of the commutant of the base subring are provided in terms of the action as well as in terms of the intersection of ideals in the crossed product ring with the base subring, specially taking into account both the case of base rings without non-trivial zero-divisors and the case of base rings with non-trivial zero-divisors.

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