[r-t] Definitions so far

[Richard Smith]

Graham John wrote:

> Change: A transposition of bells from their Places in one 
> Row into the next Row.
>
> * Simple Change: A transposition where one or more 
> adjacent pairs of bells swap Place.
>
> * Jump Change: A transposition where one or more bells 
> moves to a non-adjacent Place.

The first change of Mersey Ferry jumps from 123456 to 
231465.  A literal interpretation of these definitions 
suggest it is both a jump change and an ordinary change.  A 
pair of bells (5,6) swap place, therefore it is a simple 
change; and a bell (1) moves to a non-adjacent place, 
therefore it is also a jump change.  I rather suspect this 
isn't what you intended.

> Row: A sequence of bells at a given Stage in which each 
> bell rings once and only once.

This excludes a cylindrical row.  E.g. the row after rounds 
in cyldrical hunting on five is 21432.  Do we care about 
this?  My view is that we don't much, but it might be worth 
making a token nod to it.  We could define a row as just a 
sequence of bells, and an ordinary or simple row as one in 
which each bell rings once and only once.

RAS