2200/2197: Difference between revisions
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{{Infobox Interval | {{Infobox Interval | ||
| Name = | | Name = petrma | ||
| Color name = 3u<sup>3</sup>1oyy-2, trithu-aloyoyo negative 2nd | |||
| Comma = yes | | Comma = yes | ||
}} The | }} | ||
The '''petrma''', '''2200/2197''', is a [[13-limit]] [[comma]] measuring about 2.4{{cent}}. It often arises as the difference between other commas: ([[169/168]])/([[275/273]]), ([[352/351]])/([[676/675]]), ([[847/845]])/([[1001/1000]]), ([[625/624]])/([[4225/4224]]), and ([[729/728]])/([[123201/123200]]). It factors into ([[1575/1573]])([[10648/10647]]). | |||
Tempering out this comma in the 13-limit leads to the rank-5 '''petrmic temperament''', and enables [[petrmic chords]]. It is tempered out by several edos, most notably [[50edo]]. | |||
[[Category:Petrmic]] | |||
[[Category:Commas named after composers]] | |||
[[Category:Commas named after music theorists]] | |||
{{todo|add etymology|research|comment=is it named after Petr Pařízek?}} | |||
Latest revision as of 03:13, 4 November 2024
| Interval information |
The petrma, 2200/2197, is a 13-limit comma measuring about 2.4 ¢. It often arises as the difference between other commas: (169/168)/(275/273), (352/351)/(676/675), (847/845)/(1001/1000), (625/624)/(4225/4224), and (729/728)/(123201/123200). It factors into (1575/1573)(10648/10647).
Tempering out this comma in the 13-limit leads to the rank-5 petrmic temperament, and enables petrmic chords. It is tempered out by several edos, most notably 50edo.