[r-t] Plain Bob leadheads

Martin Bright martin at boojum.org.uk
Sat Feb 20 17:11:05 GMT 2021

On Sat, 20 Feb 2021 at 17:18, Philip Saddleton <cantab at saddleton.org.uk>

> On Fri, 2021-02-19 at 15:33 +0100, Martin Bright wrote:
> > Proof:  It's enough to prove it in the case h = (2 4 6 .. n n-1 ... 5
> > 3) in cycle notation.
> Is it? It depends whether 'Plain Bob Lead Heads' means all of them.
> It's not true for methods with a 1-lead course, but what if n-1 is not
> prime?

I was assuming “Plain Bob lead heads” meant a course of n-1 leads.  You’re
right that this is the point at which it doesn’t work in other cases.

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