352/351: Difference between revisions
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'''352/351''', the '''major minthma''', '''major gentle comma''' or '''11/13-kleisma''' is a [[small comma|small]] [[13-limit]] (also 2.3.11.13 [[subgroup]]) [[comma]] measuring about 4.9{{cent}}. This comma can be described in a number of ways. First, it is the difference between the tridecimal minor third of [[13/11]] and the Pythagorean minor third of [[32/27]], hence the name ''11/13''-kleisma. Second, it is the difference between various tridecimal intervals and their adjacent undecimal intervals such as: | '''352/351''', the '''major minthma''', '''major gentle comma''' or '''11/13-kleisma''' is a [[small comma|small]] [[13-limit]] (also 2.3.11.13 [[subgroup]]) [[comma]] measuring about 4.9{{cent}}. This comma can be described in a number of ways. First, it is the difference between the tridecimal minor third of [[13/11]] and the Pythagorean minor third of [[32/27]], hence the name ''11/13''-kleisma. (This means that when this comma is tempered, 11/8 plus three perfect fourths octave reduces to 13/8; as such, this comma can be understood as relating harmonics 11 and 13 by a chain of fourths.) Second, it is the difference between various tridecimal intervals and their adjacent undecimal intervals such as: | ||
* Between the tridecimal quartertone of [[1053/1024]] and the undecimal quartertone of [[33/32]]; | * Between the tridecimal quartertone of [[1053/1024]] and the undecimal quartertone of [[33/32]]; | ||
* Between [[16/13]] and [[27/22]]; and | * Between [[16/13]] and [[27/22]]; and | ||
Revision as of 01:09, 26 November 2024
| Interval information |
major gentle comma,
11/13-kleisma
Thulo comma
reduced
352/351, the major minthma, major gentle comma or 11/13-kleisma is a small 13-limit (also 2.3.11.13 subgroup) comma measuring about 4.9 ¢. This comma can be described in a number of ways. First, it is the difference between the tridecimal minor third of 13/11 and the Pythagorean minor third of 32/27, hence the name 11/13-kleisma. (This means that when this comma is tempered, 11/8 plus three perfect fourths octave reduces to 13/8; as such, this comma can be understood as relating harmonics 11 and 13 by a chain of fourths.) Second, it is the difference between various tridecimal intervals and their adjacent undecimal intervals such as:
- Between the tridecimal quartertone of 1053/1024 and the undecimal quartertone of 33/32;
- Between 16/13 and 27/22; and
- Between 39/32 and 11/9.
352/351 and 351/350, the ratwolfsma, are extremely close in size and make up a consecutive pair of 13-limit superparticular commas. Their difference is 123201/123200, the chalmersia, the smallest 13-limit superparticular comma; their sum is 176/175, the valinorsma, an 11-limit superparticular comma.
Temperaments
Tempering out this comma leads to a form of major minthmic temperament (full 13-limit rank-5) or majorminth temperament (2.3.11.13 subgroup rank-3), which enables major minthmic chords.
Sagittal notation
In the Sagittal system, the downward version of this comma (possibly tempered) is represented (in a secondary role) by the sagittal and is called the 13/11 kleisma, or 13/11k for short, because the simplest interval it notates is 13/11, as for example in D-F . The primary role of is 5103/5120 (7/5k). The upward version is called 11/13k or 13/11k up and is represented (in a secondary role) by .
History and etymology
This comma was known as the minthma from 2011. The word minthma is a contraction of minor thirds comma into a single word. In 2022, Margo Schulter requested it should be changed to major/greater minthma to distinguish it from 364/363, which would gain the name minor/lesser minthma.
The major gentle comma was also added to this comma in contrast to the minor gentle comma of 364/363. Both commas were essential to define the gentle temperament. The reason why the temperament was named “gentle” in the first place does not appear to be written down anywhere.