[seqfan] Re: True (?) reordering

Maximilian Hasler maximilian.hasler at gmail.com
Fri Mar 5 17:40:13 CET 2010

naïvely, I would consider "reordering" as synonym for "bijection",
and would even accept the identity map as reordering
(unless additionally given restrictions exclude it, of course).

I don't know if there is a special name for the property you give,
I often see it explicitely worded as "without a fixed point".


On Fri, Mar 5, 2010 at 5:10 PM, Eric Angelini <Eric.Angelini at kntv.be> wrote:
> Hello SeqFans,
> 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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