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arXiv math/0312257math.GRmath.CT
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关于紧群的中心

On the center of a compact group

Michael Mueger

摘要:

我们证明了Baumgaertel和Lledo的一个猜想,根据这个猜想,对每个紧群G,都有Z(G)^ \cong C(G),其中“链群”C(G)是自由阿尔贝群(乘法写作),它由G的不可约表示的同构类的集合G^模关系[Z]=[X] \cdot [Y]生成,只要Z包含在X \otimes Y中。因此中心Z(G)只依赖于G的表示环。进一步证明了每一个t-映射φ:G^ -> A到一个阿贝尔群中,即每一个映射满足φ(Z)= φ(X)φ(Y),只要X,Y,Z在G^中且Z通过限制映射G^ -> Z(G)^分解为\prec X \otimes Y.所有这些结果也适用于特征为零的代数闭域上的前代数群。

英文摘要:

We prove a conjecture due to Baumgaertel and Lledo according to which for every compact group G one has Z(G)^ \cong C(G), where the `chain group' C(G) is the free abelian group (written multiplicatively) generated by the set G^ of isomorphism classes of irreducible representations of G modulo the relations [Z]=[X]\cdot[Y] whenever Z is contained in X \otimes Y. Thus the center Z(G) depends only on the representation ring of G. Furthermore, we prove that every `t-map' phi: G^ -> A into an abelian group, i.e. every map satisfying phi(Z)=phi(X)phi(Y) whenever X,Y,Z in G^ and Z\prec X\otimes Y, factors through the restriction map G^ -> Z(G)^. All these results also hold for proalgebraic groups over algebraically closed fields of characteristic zero.

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