[r-t] Plain Bob leadheads

Fred Bone Fred.Bone at dial.pipex.com
Sun Feb 21 20:07:46 GMT 2021

On 19 February 2021 at 9:14, Mark Davies said:

> Please can someone produce, or point me at, a concise proof of this lemma:
> PB1: In a palindromic treble-dominated method with Plain Bob leadheads, on
> an even number of bells, the lead end place notations must be 12 or 1n.

What is the definition of "palindromic"? Does it necessarily exclude the 
use of jump changes?

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