[r-t] Parity

Leigh Simpson simple57uk at yahoo.co.uk
Sun Jun 24 21:36:48 UTC 2007

> First. It is not necessary to sort the changes to
> derive the 'factorial 
> index'.

Thanks for this, it's all quite interesting. This sort
of stuff seems to be covered on this Wikipedia page:


which describes a "Factoradic" as a number providing a
lexicographic index for perms.


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