Consistency: Difference between revisions

Inthar (talk | contribs)
m clarify which definitions are being referred to
Inthar (talk | contribs)
m It turns out that the purported counterexample is not actually a counterexample
Line 15: Line 15:
(If such an approximation exists, it must be the only such approximation, since changing one interval would make that interval go over the 50% error threshold.)
(If such an approximation exists, it must be the only such approximation, since changing one interval would make that interval go over the 50% error threshold.)


In this formulation, 12edo represents the chord 1:3:5:7:9:17:19 consistently. Note: The chord-based definition disagrees with the set-of-intervals-based definition for some chords such as 1:3:81:243 in [[80edo]]. This is a feature, not a bug, as the distinction can be useful in some circumstances.
In this formulation, 12edo represents the chord 1:3:5:7:9:17:19 consistently. Question: Is using this formulation with a chord C equivalent to using the first formulation with S = the [[diamond function]] applied to C?


The concept only makes sense for edos and not for non-edo rank-2 (or higher) temperaments, since for some choices of generator sizes in these temperaments, you can get any ratio you want to arbitary accuracy by piling up a lot of generators (assuming the generator is an irrational fraction of the octave).
The concept only makes sense for edos and not for non-edo rank-2 (or higher) temperaments, since for some choices of generator sizes in these temperaments, you can get any ratio you want to arbitary accuracy by piling up a lot of generators (assuming the generator is an irrational fraction of the octave).