[r-t] Parity

Robin Woolley robin at robinw.org.uk
Sun Jun 24 07:19:24 UTC 2007


Whilst out jogging this morning, I realised that the algorithm I gave 
yesterday made no provision for a decrease in the factorial index. As far as 
I can see, the following should make up for that:

In swapping AB, then i if A=>B, we have B+1.A else B.A-1

I hope that this is correct, now.

Robin.







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