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arXiv 1409.0299math.AC
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幺半群代数的理想类群

Ideal class groups of monoid algebras

Husney Parvez Sarwar

摘要:

设$A\subset B$是交换约化环的扩张,$M\subset N$是正交换可消无挠幺半群的扩张.证明了$A$在$B$中是次整闭的,$M$在$N$中是次整闭的当且仅当$B$的可逆$A$ -子模群同构于$B[N]$的可逆$A[M]$ -子模群.在$M=N$的情况下,我们证明了相同的假设,环的扩张是减少。

英文摘要:

Let $A\subset B$ be an extension of commutative reduced rings and $M\subset N$ an extension of positive commutative cancellative torsion-free monoids. We prove that $A$ is subintegrally closed in $B$ and $M$ is subintegrally closed in $N$ if and only if the group of invertible $A$-submodules of $B$ is isomorphic to the group of invertible $A[M]$-submodules of $B[N]$. In case $M=N$, we prove the same without the assumption that the ring extension is reduced.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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