[r-t] Cyclic 7-parts of major

Barrie Hendry barriehen at aol.com
Thu Sep 26 11:27:28 BST 2019

In the RW of March 30 2007 Neil Bennett wrote the 40th anniversary stuff about Smiths 23 spliced.  That had a composition 5152 Plain Bob Major  By Roger LeighW B M H  2345678
-   - 6  42635  1      7856342Six times repeatedFirst rung at Shore on 2/4/1959
Hope this helpsBarrie Hendry

-----Original Message-----
From: Don Morrison <dfm at ringing.org>
To: ringing-theory <ringing-theory at bellringers.org>
Sent: Wed, 25 Sep 2019 22:17
Subject: Re: [r-t] Cyclic 7-parts of major

On Wed, Sep 25, 2019 at 4:57 PM Andrew Johnson <andrew_johnson at uk.ibm.com> wrote:
> Just noodling around using plain bob lead-ends for a part-end gives
> higher CompLib scores than true cyclic scores, but I don't know if
> this is by chance as there are some high scoring cyclic compositions
> on CompLib.

I suspect it’s probably a result of at least two factors:

• While I find it rather difficult to get my head wrapped around the composite “music” score complib quotes, it does appear to include CRUs, both at the back and the front of rows, internal runs, and to give an extra kick to 56 flavored rollups. It seems reasonable to suppose the first and third of those three might lead to a bit of an advantage for Plain Bob lead things.

• But even if not, it is surprising how closely aligned, under various constraints, the maximum numbers of runs (of 4 bells, front and back only; don’t know if it applies to longer ones or internal ones) for the two different styles of seven parts seem to be. I don’t really grasp why this should be, but empirically it seems to. Perhaps it has something to do with the distribution of such runs between parts, and between leads more or less removed from the part heads? I’ve no evidence to back up such a conjectured explanation, though. I’m guessing someone brighter than I will tell us within twenty-four hours!

I naïve assume that odd ball part heads, still of order 7, probably won’t do as well as the more natural Plain Bob and cyclic ones, but I wonder if that assumption is actually warranted?

Don Morrison <dfm at ringing.org>
“I’ll grant you it’s obvious. Trouble is, just because
things are obvious doesn’t mean they’re true.”
                        — Terry Pratchett, /Wyrd Sisters/
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