[r-t] Plain Bob leadheads

[Martin Bright]

Hi Mark,

These seem to be the only two changes that fix the treble and
normalise the subgroup of Plain Bob lead heads - at least my computer
tells me this is true on 8.  I wonder whether that can be turned into
a proof.

All the best,
Martin

On Fri, 19 Feb 2021 at 10:15, Mark Davies <mark at snowtiger.net> wrote:
>
> 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.
>
> Thank you!
>
> MBD
>
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