User:CompactStar/RST notation
RST notation is a notation for just intonation and regular temperaments that was devised by CompactStar. Iit is an extension of 3-limit chain-of-fifths notation where prefixes are added to convey higher-limit commatic alterations. The prefixes for formal commas are obtained by going through a truncated version of the alphabet (RSTUVWXYZ) and appending "uper"/"ub". If the letter is a vowel we discard the first "u". Thus the formal comma for 5 has the prefix pair "ruper-"/"rub-", 7 has the prefix pair "super-"/"sub-", 11 has prefix pair "tuper-"/"tub-", etc. These are abbreviated using as rp/rb, sp/sb, tp/tb, etc. This system is a generalization of the widespread usage of the Latin prefixes super-/sub- for alteration of Pythagorean intervals by 64/63 which, although ad-hoc, has the advantage of being easily typable and fairly easily memorizable.
Formal commas
| Prime limit | Formal comma | Prefix pair |
|---|---|---|
| 5 | 81/80 | ruper-/rub- |
| 7 | 64/63 | super-/sub- |
| 11 | 33/32 | tuper-/tub- |
| 13 | 1053/1024 | uper-/ub- |
| 17 | 4131/4096 | vuper-/vub- |
| 19 | 513/512 | wuper-/wub- |
| 23 | 736/729 | xuper-/xub- |
| 29 | 261/256 | yuper-/yub- |
| 31 | 32/31 | zuper-/zub- |