[r-t] Shipway Minor
Alexander Holroyd
holroyd at math.ubc.ca
Tue Jun 17 02:16:24 UTC 2014
> On 16 Jun 2014, at 22:49, Alexander Holroyd <holroyd at math.ubc.ca> wrote:
>> Well, don't forget that the "division" (or lead) of shipway consists of
>> two eights, so the Stedman Triples type calls already occur in two
>> places in the lead (as they do in Stedman). So I don't know what the
>> "obvious calls" are, and the extremes are actually division-end calls
>> (if you start at a symmetry point). So my extent actually has 5
>> different types of call, although that doesn't bother me…
>
> I make no apology for considering the "division end" to not be at the
> same point as we (conventionally) start the method. I also consider both
> quick and slow eights to be separate divisions (and the method to be
> made of strictly alternating between the two), so standard Stedman bobs
> are in my view all at division ends.
Well, under this logic, I suppose every call in every method is at a
division end. One can simply define the lead to be composed of as many
divisions as desired. :-) Hence the need for human judgement in
determining "reasonableness". I think we basically agree on what this
should mean - I just prefer to do it without the need for the intermediate
concept of a division (which itself requires judgement if it is to be
useful). In particular I completely agree that Shipway with only bobs and
singles would be better (but I be equally happy with bobs and extremes).
>> I suspect a MEB is possible with only one type of call, even _any_ call
>> that doesn't obviously fail for some reason. In fact there might even
>> be a general theorem to that effect.
>
> Sketch of proof if the call you want to use can access every possible
> course (usually true for a single):
Yup, sounds right!
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