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• 04:21, 19 September 2026 CompactStar talk contribs created page 3.5 subgroup (Created page with "The '''3.5 subgroup''' is a non-octave just intonation subgroup consisting of rational intervals where 3 and 5 are the only allowable prime factors, so that every such interval may be written as a ratio of integers which are products of 3 and 5. This is an infinite set. Some examples of intervals in this subgroup are 5/3, 9/5, 27/25, and so on. The 3.5 subgroup is a retraction of the 5-limit, obtained by removing prime 2. Its simples...") Tags: Mobile edit Mobile web edit