系数在半模II中的幺半群的上同调幺半群
Cohomology monoids of monoids with coefficients in semimodules II
摘要:
我们将作者在以前的论文中介绍的系数在$M$上的半模中的任意幺半群$M$的新旧上同调幺半群与幺半群和群扩张联系起来。更确切地说,旧的和新的第二上同调幺半群描述了半模的Schreier扩张幺半群,和新的第三上同调幺半群涉及到一定的群扩张问题。
英文摘要:
We relate the old and new cohomology monoids of an arbitrary monoid $M$ with coefficients in semimodules over $M$, introduced in the author's previous papers, to monoid and group extensions. More precisely, the old and new second cohomology monoids describe Schreier extensions of semimodules by monoids, and the new third cohomology monoid is related to a certain group extension problem.
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