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arXiv math/0512278math.FAmath.OA
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关于纠缠遍历定理

On the entangled ergodic theorem

francesco fidaleo

摘要:

设$U$是作用在希尔伯特空间H上的酉算子,$α:\{1,..., m\}\mapsto\{1,..., k\}$是集合$\{1,..., m\}$的划分.证明了当$A_{j}$属于H上所有紧算子的代数时,遍历平均$$ \frac{1}{N^{k}}\sum_{n_{1},...,n_{k}=0}^{N-1} U^{n_{α(1)}}A_{1}U^{n_{α(2)}}... U^{n_{α(m-1)}}A_{m-1}U^{n_{α(m)}} $$在弱算子拓扑中收敛.我们特别写出了在对划分情况下这些遍历平均的公式。在概周期情形下,给出了对算子$A_{j}$没有任何限制的一些结果.

英文摘要:

Let $U$ be a unitary operator acting on the Hilbert space H, and $α:\{1,..., m\}\mapsto\{1,..., k\}$ a partition of the set $\{1,..., m\}$. We show that the ergodic average $$ \frac{1}{N^{k}}\sum_{n_{1},...,n_{k}=0}^{N-1} U^{n_{α(1)}}A_{1}U^{n_{α(2)}}... U^{n_{α(m-1)}}A_{m-1}U^{n_{α(m)}} $$ converges in the weak operator topology if the $A_{j}$ belong to the algebra of all the compact operators on H. We write esplicitely the formula for these ergodic averages in the case of pair--partitions. Some results without any restriction on the operators $A_{j}$ are also presented in the almost periodic case.

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