[seqfan] Re: True (?) reordering

Joerg Arndt arndt at jjj.de
Sat Mar 6 10:11:37 CET 2010

Permutation is the word, and yes, that (as a map) is a bijection.
A derangement is a permutation without fixed points.

> [...]

Regarding cycles:
can a permutation of the naturals have an
infinite cycle (my guess: no)?

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