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arXiv math/0501142math.DSmath.AC
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有理数的混合作用

Mixing actions of the rationals

Richard Miles, Tom Ward

摘要:

我们研究混合性质的代数行动的$\mathbb Q^d$,特别是表明,素混合$\mathbb Q^d$行动的连通群是混合的所有订单,是$\mathbb Z^d$ -行动的情况。这表明使用一个统一的结果的解决方案的$S$ -单位方程的特征零领域由于Evertse,Schlickewei和施密特。相比之下,代数行动的更大的集团$\mathbb Q^*$表现出相当不同的,有穷级的混合可能的连通群。

英文摘要:

We study mixing properties of algebraic actions of $\mathbb Q^d$, showing in particular that prime mixing $\mathbb Q^d$ actions on connected groups are mixing of all orders, as is the case for $\mathbb Z^d$-actions. This is shown using a uniform result on the solution of $S$-unit equations in characteristic zero fields due to Evertse, Schlickewei and Schmidt. In contrast, algebraic actions of the much larger group $\mathbb Q^*$ are shown to behave quite differently, with finite order of mixing possible on connected groups.

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