[seqfan] Re: True (?) reordering

Ray Chandler rayjchandler at sbcglobal.net
Fri Mar 5 17:27:38 CET 2010

Reordering of the natural numbers does not imply that a(n)=n is disallowed. 

That would be a reordering with no fixed points.

> -----Original Message-----
> when one reads in the OEIS something like:
> "A reordering of the natural numbers", does this mean that we 
> never have n = a(n) in the reordered sequence? If not, is 
> there a name/concept for that? 
> Best,
> É.

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