[r-t] History

King, Peter R peter.king at imperial.ac.uk
Mon Jun 9 09:56:44 UTC 2014

>> I wouldn't alter the definition of a change, but I would introduce a 
>> definition for a null change. As a null change is then not a change, 
>> you just do not count it as a change.

>I'm sorry, but I think this is an exceedingly ill-advised suggestion.

I would agree with Don on this. Surely the "null change" is just the identity permutation and as such just as much a permutation as any other, indeed without it the permutation group would not be a group!

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