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Semicomma : ウィキペディア英語版
Semicomma

The semicomma,〔Haluska, Jan (2003). ''The Mathematical Theory of Tone Systems'', p.xxix. ISBN 80-88683-28-9.〕 also Fokker's comma (after 31-TET pioneer Adriaan Fokker), is type of small musical interval, or comma, in microtonal music equivalent to 2109375:2097152,〔 or 3^3\cdot5^7:2^. This is a ratio of approximately 1:1.0058283805847168, or about 10.06 cents〔"(List of Intervals )", ''Huygens-Fokker.org''.〕 (). It is derived from the difference in pitch between three 75/64 just augmented seconds () and one 8/5 just minor sixth () begun on the same root ((3 × 274.58) - (1 × 813.69) = 823.74 - 813.69 = 10.05 cents).〔"(Semicomma )", ''Xenharmonic''.〕
==See also==

*Septimal kleisma
*Septimal semicomma

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