[r-t] Plain Bob lead heads/ends (was ringing-theory Digest, Vol 89, Issue 9)

Philip Saddleton pabs at cantab.net
Thu Feb 9 20:54:04 UTC 2012

Correct. If you are looking for a sufficient condition that does not 
involve the complete set, it is that there are two Plain Bob lead ends 
with the transposition between them being of order n-1 (which is 
trivially true if n-1 is prime).

[the transposition can be used to define a coursing order, and two 
methods with the same coursing order must have the same set of lead heads]


Don Morrison said  on 09/02/2012 20:26:
> I believe Philip's point was that the only way to have the complete
> set of lead ends of a method be the same as those of Plain Bob at the
> same stage, is if the set of lead heads are the same as those of Plain
> Bob, too. I presume he will correct me if I am mistaken.

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