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581EDO - Page 2 - The Sagittal forum

581EDO

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Dave Keenan
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Re: 581EDO

Postby Dave Keenan » Thu Apr 20, 2017 10:12 am

Here's George's proposal in a form that makes it easier to evaluate flag and shaft arithmetic, and apotome complements.


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Re: 581EDO

Postby George Secor » Fri Apr 21, 2017 11:58 am


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Re: 581EDO

Postby Dave Keenan » Fri Apr 21, 2017 1:38 pm

Thanks George. I think that's a major improvement. Here it is numbered:


Even when the double-shaft symbols don't recapitulate the flags for a subsequence of the single-shaft symbols, it is nice if a consistent value can be assigned to the second shaft, usually the value of the :(|): symbol (30). Unfortunately, this breaks down with the symbols for 7 and 38, :|~: and :||~:, and those for 18 and 49, :/|~: and :/||~:. And with the symbols for 19 and 48, :(|(: and :(||(:, there is an unfortunate crossover, relative to 18 and 49. [Edit: And 8 and 37, :~|(: and :~||(:, have the same kind of crossover with 7 and 38.]

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Re: 581EDO

Postby Dave Keenan » Sat Apr 22, 2017 11:59 am

I believe there was a typo for 6°581, which should be :.::|~:. I have corrected this, and added mixed-sagittal below. I have also checked that your double-shaft symbols correctly match the mixed sagittal, as per figure 13 on page 24 of .

The remaining problems with this notation are all caused by the fact that the symbols for 7 and 8 degrees, which are the 23-comma :|~: and the 17-comma :~|(:, are out of size order, relative to their untempered values, while the symbols for 18 and 19 degrees, which have the same flag combinations as the apotome-complements of 7 and 8 respectively, are not out of size order. They are the 5:23-small-diesis :/|~: and the 5:11-small-diesis :(|(:.


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Dave Keenan
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Re: 581EDO

Postby Dave Keenan » Sat Apr 22, 2017 1:13 pm

So it all comes down to finding sufficient unaccented symbols between 2 and 11 degrees, without any size-order reversals, and with consistent flag arithmetic. We can have gaps of at most 3 degrees between unaccented symbols. Here are all the options. Size order reversals are indicated by "<->".


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Re: 581EDO

Postby Dave Keenan » Sat Apr 22, 2017 3:50 pm

Of course we should use the lowest prime symbols for degrees 2 and 11. I only included the 19s and 19C symbols so you'd know I hadn't forgotten them, and that there really are no unaccented symbols that map to 3 or 10 degrees. But the left scroll must still have the value 2 since we want :/|\: = 26 and :)/|\: = 28.

Here I show the implied value of the left boathook for each symbol that contains it. None of them is compatible with any other.


The only other symbols that contain the left boathook are the following, but we are not forced to use either of them.


So the puzzle is to choose a subset of the symbols on degrees 4 thru 9 above, such that
(a) at most one of them contains a left boathook,
(b) there is at most one symbol from each size-reversed pair,
(c) there are no gaps wider than 3 degrees.

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Re: 581EDO

Postby Dave Keenan » Sat Apr 22, 2017 4:37 pm

Since there are 6 symbols, there are 2⁶ subsets, and we can enumerate them as a binary count. The right-hand column indicates at least one condition that the subset violates. ">3" = gap wider than 3 degrees. "~|" = incompatible left boathook values. "<->" size order reversal.

And we find that there is one, and only one, solution.


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Re: 581EDO

Postby Dave Keenan » Sat Apr 22, 2017 5:10 pm

So, the only change required to George's last proposal is to eliminate 17C :~|(: for 8 degrees in favour of 143C :~~|: for 9 degrees. However, I note that we do not need the non-athenian symbol 5:23S :/|~: for 18 degrees and suggest we eliminate it to reduce the number of cores that must be learned. And I note that we obtain a more regular, and hence more easily learned pattern of accents, if we change 3 degrees from :.::)|(: to :'::|(:. Here's the result.


I think there is still some improvement possible in the pattern of accents, but I need to do other things for a while.


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