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arXiv 2212.00511math.RTmath.GR
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关于移位Burnside偏集函子的本质代数

On the essential algebra of the shifted Burnside biset functor

Nadia Romero

摘要:

我们描述的本质代数,$\widehat{kB_T}(G)$,伯恩赛德偏集函子移位的一个组$T$,在一个组$G$,在两种情况下。首先,当$G$和$T$都是有限阿贝尔群,并且$k$是特征$0$的域时。在这种情况下,$\widehat{kB_T}(G)$同构于移位星代数的商,其根据$G\times G\times T$的子群定义。第二种情形是当$G$和$T$是满足$(|G|, |T|)=1$的任意有限群且$k$是交换酉环时.在这种情况下,$\widehat{kB_T}(G)$同构于$Out(G)$和$kB^{Z(G)}(T)$的半直积,即系数在$Z(G)$中的$T$的单项伯恩赛德环。本文的目的是考虑由$kB_T(G\times G)$中的传递元素构成的$\widehat{kB_T}(G)$的生成元的自然集合,并探讨在此集合中可能给出$\widehat{kB_T}(G)$的基的一些情况.

英文摘要:

We describe the essential algebra, $\widehat{kB_T}(G)$, of the Burnside biset functor shifted by a group $T$, at a group $G$, in two cases. First, when $G$ and $T$ are both finite abelian groups and $k$ is a field of characteristic $0$. In this case, $\widehat{kB_T}(G)$ is isomorphic to a quotient of the shifted star algebra, which is defined in terms of the subgroups of $G\times G\times T$. The second case is when $G$ and $T$ are any finite groups satisfying $(|G|, |T|)=1$ and $k$ is a commutative unitary ring. In this case, $\widehat{kB_T}(G)$ is isomorphic to a semidirect product of $Out(G)$ and $kB^{Z(G)}(T)$, the monomial Burnside ring of $T$ with coefficients in $Z(G)$. The aim of the article is to consider the natural set of generators of $\widehat{kB_T}(G)$ coming from the transitive elements in $kB_T(G\times G)$ and explore some cases in which it is possible to give a basis for $\widehat{kB_T}(G)$ in this set.

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