We present an argument (due originally to R. C. Lyndon) which completes the proof of the following theorem: Every free group word which is not a proper power can represent any permutation of an infinite set.
展开▼
机译：我们提出一个论点（最初是由于R. C. Lyndon所致），它完成了以下定理的证明：每个不具有适当幂次的自由组词都可以表示无限集的任何置换。
展开▼
