关于Popa的循环超刚性定理
On Popa's Cocycle Superrigidity Theorem
摘要:
这些笔记包含遍历理论帐户的Cocycle超刚性定理最近发现的索林波帕。我们的状态和证明的结果的一个相对版本,讨论了一些应用可测的等价关系,并指出高斯行动(“刚性”组)满足波帕定理的假设。
英文摘要:
These notes contain an Ergodic-theoretic account of the Cocycle Superrigidity Theorem recently discovered by Sorin Popa. We state and prove a relative version of the result, discuss some applications to measurable equivalence relations, and point out that Gaussian actions (of ``rigid'' groups) satisfy the assumptions of Popa's theorem.
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