Syntonic–31 equivalence continuum: Difference between revisions

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The '''syntonic-31 equivalence continuum''' is a continuum of 5-limit temperaments which equate a number of [[81/80|syntonic commas (81/80)]] with a [[31st-octave temperaments|31-comma ({{monzo| -49 31 }})]]. This continuum is theoretically interesting in that these are all 5-limit temperaments supported by [[31edo]].
The '''syntonic–31 equivalence continuum''' is a [[equivalence continuum|continuum]] of 5-limit temperaments which equate a number of [[81/80|syntonic commas (81/80)]] with a [[31st-octave temperaments|31-comma ({{monzo| -49 31 }})]]. This continuum is theoretically interesting in that these are all 5-limit temperaments supported by [[31edo]].


All temperaments in the continuum satisfy {{nowrap|(81/80)<sup>''n''</sup> ~ {{monzo|-49 31}}}}. Varying ''n'' results in different temperaments listed in the table below. It converges to [[meantone]] as ''n'' approaches infinity. If we allow non-integer and infinite ''n'', the continuum describes the set of all [[5-limit]] temperaments supported by [[31edo]] due to it being the unique equal temperament that tempers both commas and thus tempers all combinations of them. The just value of ''n'' is approximately 7.46781…, and temperaments having ''n'' near this value tend to be the most accurate ones.
All temperaments in the continuum satisfy {{nowrap|(81/80)<sup>''n''</sup> ~ {{monzo| -49 31 }}}}. Varying ''n'' results in different temperaments listed in the table below. It converges to [[meantone]] as ''n'' approaches infinity. If we allow non-integer and infinite ''n'', the continuum describes the set of all [[5-limit]] temperaments supported by [[31edo]] due to it being the unique equal temperament that tempers out both commas and thus tempers out all combinations of them. The just value of ''n'' is approximately 7.46781…, and temperaments having ''n'' near this value tend to be the most accurate ones.


{| class="wikitable center-1 center-2"
{| class="wikitable center-1"
|+ style="font-size: 105%;" | Temperaments in the continuum
|+ style="font-size: 105%;" | Temperaments in the continuum
|-
|-
Line 14: Line 14:
|-
|-
| 0
| 0
| [[31st-octave temperaments|31 &amp; 31c]]
| [[31st-octave temperaments|31-commatic]]
|  
|  
| {{monzo| -49 31 }}
| {{Monzo| -49 31 }}
|-
|-
| 1
| 1
| 31 &amp; 12c
| 31 & 12c
|  
|  
| {{monzo| -45 27 1 }}
| {{Monzo| -45 27 1 }}
|-
|-
| 2
| 2
| [[High badness temperaments #Quasimoha|Quasimoha]]
| [[Miscellaneous 5-limit temperaments #Quasimoha|Quasimoha]]
| 2353579470675/2199023255552
| 2353579470675/2199023255552
| {{monzo| -41 23 2 }}
| {{Monzo| -41 23 2 }}
|-
|-
| 3
| 3
| [[High badness temperaments #Oncle|Oncle]]
| [[Miscellaneous 5-limit temperaments #Oncle|Oncle]]
| 145282683375/137438953472
| 145282683375/137438953472
| {{monzo| -37 19 3 }}
| {{Monzo| -37 19 3 }}
|-
|-
| 4
| 4
| [[Orwellismic temperaments #Sentinel|Sentinel]]
| [[Miscellaneous 5-limit temperaments #Sentinel|Sentinel]]
| 8968066875/8589934592
| 8968066875/8589934592
| {{monzo| -33 15 4 }}
| {{Monzo| -33 15 4 }}
|-
|-
| 5
| 5
| [[High badness temperaments #Tritonic|Tritonic]]
| [[Miscellaneous 5-limit temperaments #Tritonic|Tritonic]]
| 553584375/536870912
| 553584375/536870912
| {{monzo| -29 11 5 }}
| {{Monzo| -29 11 5 }}
|-
|-
| 6
| 6
| [[Ampersand]]
| [[Ampersand]]
| 34171875/33554432
| 34171875/33554432
| {{monzo| -25 7 6 }}
| {{Monzo| -25 7 6 }}
|-
|-
| 7
| 7
| [[Orson]]
| [[Orson]]
| 2109375/2097152
| 2109375/2097152
| {{monzo| -21 3 7 }}
| {{Monzo| -21 3 7 }}
|-
|-
| 8
| 8
| [[Würschmidt]]
| [[Würschmidt]]
| 393216/390625
| 393216/390625
| {{monzo| 17 1 -8 }}
| {{Monzo| 17 1 -8 }}
|-
|-
| 9
| 9
| [[Valentine]]
| [[Valentine]]
| 1990656/1953125
| 1990656/1953125
| {{monzo| 13 5 -9 }}
| {{Monzo| 13 5 -9 }}
|-
|-
| 10
| 10
| [[Mynic]]
| [[Mynic]]
| 10077696/9765625
| 10077696/9765625
| {{monzo| 9 9 -10 }}
| {{Monzo| 9 9 -10 }}
|-
|-
| 11
| 11
| [[High badness temperaments #Nusecond|Nusecond]]
| [[Miscellaneous 5-limit temperaments #Nusecond|Nusecond]]
| 51018336/48828125
| 51018336/48828125
| {{monzo| 5 13 -11 }}
| {{Monzo| 5 13 -11 }}
|-
|-
| 12
| 12
| [[High badness temperaments #Cypress|Cypress]]
| [[Miscellaneous 5-limit temperaments #Cypress|Cypress]]
| 258280326/244140625
| 258280326/244140625
| {{monzo| 1 17 -12 }}
| {{Monzo| 1 17 -12 }}
|-
|-
| 13
| 13
| [[High badness temperaments #Diesic|Diesic]]
| [[Miscellaneous 5-limit temperaments #Diesic|Diesic]]
| 10460353203/9765625000
| 10460353203/9765625000
| {{monzo| -3 21 -13 }}
| {{Monzo| -3 21 -13 }}
|-
|-
| 14
| 14
| 31 &amp; 13c
| 31 & 13c
| 847288609443/781250000000
| 847288609443/781250000000
| {{monzo| -7 25 -14 }}
| {{Monzo| -7 25 -14 }}
|-
|-
| …
| …
Line 94: Line 94:
|-
|-
| ∞
| ∞
| [[Meantone family|Meantone]]
| [[Meantone]]
| [[81/80]]
| [[81/80]]
| {{monzo| -4 4 -1 }}
| {{Monzo| -4 4 -1 }}
|}
|}


Line 125: Line 125:
|}
|}


== Quadlayo (31 &amp; 12c) ==
== Quadlayo (31 & 12c) ==
In the [[circle-of-fifths notation]], 5/4 is mapped to the quadruple-diminished fifth (C-Gbbbb).
In the [[chain-of-fifths notation]], 5/4 is mapped to the quadruple-diminished fifth (C-Gbbbb).


Subgroup: 2.3.5
[[Subgroup]]: 2.3.5


Comma list: {{monzo| -45 27 1 }} = 38127987424935/35184372088832
[[Comma list]]: {{monzo| -45 27 1 }}


Mapping: {{mapping| 1 0 45 | 0 1 -27 }}
{{Mapping|legend=1| 1 0 45 | 0 1 -27 }}
: mapping generators: ~2, ~3


Optimal tuning (POTE): ~2 = 1\1, ~3/2 = 696.950
[[Optimal tuning]]s:
* [[WE]]: ~2 = 1201.6167{{c}}, ~3/2 = 697.8886{{c}}
: [[error map]]: {{val| +1.617 -2.450 -0.204 }}
* [[CWE]]: ~2 = 1200.000{{c}}, ~3/2 = 696.9075{{c}}
: error map: {{val| 0.000 -5.048 -2.815 }}


{{Optimal ET sequence|legend=1| 12c, 19c, 31, 43c, 50c }}
{{Optimal ET sequence|legend=1| 12c, 19c, 31, 136bc, 167bc, 198bc, 229bc }}


Badness: 2.993628
[[Badness]] (Sintel): 70.2


[http://x31eq.com/cgi-bin/rt.cgi?ets=31_12c&limit=5 The temperament finder - 5-limit 31 & 12c]
[http://x31eq.com/cgi-bin/rt.cgi?ets=31_12c&limit=5 The temperament finder - 5-limit 31 & 12c]


== Quadlaleyo (31 &amp; 70c) ==
== Ampersand ==
Subgroup: 2.3.5
: ''For extensions, see [[Gamelismic clan #Miracle]].''


Comma list: {{monzo| -54 18 11 }} = 18917016064453125/18014398509481984
Ampersand is the 5-limit version of miracle, tempering out the [[ampersand comma]], which is the difference between a perfect fifth and a stack of six [[16/15|classical diatonic semitones]]. It can be described as the {{nowrap| 31 & 41 }} temperament, corresponding to {{nowrap| ''n'' {{=}} 6 }}.


Mapping: {{mapping| 1 3 0 | 0 -11 18 }}
[[Subgroup]]: 2.3.5


Optimal tuning (POTE): ~2 = 1\1, ~32768/30375 = 154.597
[[Comma list]]: 34171875/33554432


{{Optimal ET sequence|legend=1| 8c, 23c, 31, 39c, 132, 163 }}
{{Mapping|legend=1| 1 1 3 | 0 6 -7 }}
: mapping generators: ~2, ~16/15


Badness: 2.067160
[[Optimal tuning]]s:  
* [[WE]]: ~2 = 1200.8367{{c}}, ~16/15 = 116.7546{{c}}
: [[error map]]: {{val| +0.837 -0.591 -1.086 }}
* [[CWE]]: ~2 = 1200.000{{c}}, ~16/15 = 116.6802{{c}}
: error map: {{val| 0.000 -1.874 -3.075 }}


[http://x31eq.com/cgi-bin/rt.cgi?ets=31_70c&limit=5 The temperament finder - 5-limit 31 & 70c]
{{Optimal ET sequence|legend=1| 10, 21, 31, 41, 72 }}
 
[[Badness]] (Sintel): 3.89
 
== Valentine (5-limit) ==
: ''For extensions, see [[Gamelismic clan #Valentine]].''


== Ampersand ==
The 5-limit version of valentine tempers out the [[valentine comma]], which is the difference between a perfect fifth and a stack of nine [[25/24|classical chromatic semitones]]. It can be described as the {{nowrap| 31 & 46 }} temperament, corresponding to {{nowrap| ''n'' {{=}} 9 }}.
{{See also| Gamelismic clan #Miracle }}


Subgroup: 2.3.5
[[Subgroup]]: 2.3.5


Comma list: {{monzo| -25 7 6 }} = 34171875/33554432
[[Comma list]]: 1990656/1953125


Mapping: {{mapping| 1 1 3 | 0 6 -7 }}
{{Mapping|legend=1| 1 1 2 | 0 9 5 }}
: mapping generators: ~2, ~25/24


Optimal tuning (POTE): ~2 = 1\1, ~16/15 = 116.673
[[Optimal tuning]]s:
* [[WE]]: ~2 = 1199.3579{{c}}, ~25/24 = 77.9973{{c}}
: [[error map]]: {{val| -0.642 -0.621 +2.389 }}
* [[CWE]]: ~2 = 1200.0000{{c}}, ~25/24 = 77.9807{{c}}
: error map: {{val| 0.000 -0.129 +3.590 }}


{{Optimal ET sequence|legend=1| 10, 21, 31, 41, 72 }}
{{Optimal ET sequence|legend=1| 15, 31, 46, 77, 123 }}


Badness: 0.165755
[[Badness]] (Sintel): 2.88


== Counterwürschmidt ==
== Quadlaleyo (31 & 70c) ==
{{See also| Mirkwai clan #Grendel }}
[[Subgroup]]: 2.3.5


Subgroup: 2.3.5
[[Comma list]]: {{monzo| -54 18 11 }}


Comma list: {{monzo| 55 -1 -23 }}
{{Mapping|legend=1| 1 -8 18 | 0 11 -18 }}
: mapping generators: ~2, ~30375/16384


Mapping: {{mapping| 1 9 2 | 0 -23 1 }}
[[Optimal tuning]]s:
* [[WE]]: ~2 = 1201.0416{{c}}, ~32768/30375 = 1046.3102{{c}}
: [[error map]]: {{val| +1.042 -0.876 -1.149 }}
* [[CWE]]: ~2 = 1200.0000{{c}}, ~32768/30375 = 1045.4008{{c}}
: error map: {{val| 0.000 -2.546 -3.529 }}


: mapping generators: ~2, ~5/4
{{Optimal ET sequence|legend=1| 8c, 31, 101c, 132, 163 }}


Optimal tuning (CTE): ~2 = 1\1, ~5/4 = 386.8710
[[Badness]] (Sintel): 48.5


{{Optimal ET sequence|legend=1| 28b, 31, 90, 121, 152, 335, 822, 1157c, 1492c }}
[http://x31eq.com/cgi-bin/rt.cgi?ets=31_70c&limit=5 The temperament finder - 5-limit 31 & 70c]


Badness: 0.420
== Lalasepbigu (31 & 13c) ==
[[Subgroup]]: 2.3.5


== Lalasepbigu (31 &amp; 13c) ==
[[Comma list]]: 847288609443/781250000000
Subgroup: 2.3.5


Comma list: {{monzo| -7 25 -14 }} = 847288609443/781250000000
{{Mapping|legend=1| 1 -7 -13 | 0 14 25 }}
: mapping generators: ~2, ~19683/12500


Mapping: {{mapping| 1 7 12 | 0 -14 -25 }}
[[Optimal tuning]]s:  
* [[WE]]: ~2 = 1200.3614{{c}}, ~19683/12500 = 735.7984{{c}}
: [[error map]]: {{val| +0.361 -3.307 +3.498 }}
* [[CWE]]: ~2 = 1200.0000{{c}}, ~19683/12500 = 735.5950{{c}}
: error map: {{val| 0.000 -3.625 -3.560 }}


Optimal tuning (POTE): ~2 = 1\1, ~25000/19683 = 464.423
[[Optimal tuning]] ([[POTE]]): ~2 = 1200.000{{c}}, ~25000/19683 = 464.423{{c}}


{{Optimal ET sequence|legend=1| 13c, 18bc, 31, 44c, 49bc, 75c, 80bc }}
{{Optimal ET sequence|legend=1| 13c, 18bc, 31 }}


Badness: 2.094918
[[Badness]] (Sintel): 49.1


[http://x31eq.com/cgi-bin/rt.cgi?ets=31_13c&limit=5 The temperament finder - 5-limit 31 & 13c]
[http://x31eq.com/cgi-bin/rt.cgi?ets=31_13c&limit=5 The temperament finder - 5-limit 31 & 13c]
== Counterwürschmidt ==
: ''For extensions, see [[Mirkwai clan #Grendel]].''
[[Subgroup]]: 2.3.5
[[Comma list]]: {{monzo| 55 -1 -23 }}
{{Mapping|legend=1| 1 -14 3 | 0 23 -1 }}
: mapping generators: ~2, ~8/5
[[Optimal tuning]]s:
* [[WE]]: ~2 = 1200.0000{{c}}, ~8/5 = 813.0556{{c}}
: [[error map]]: {{val| -0.120 +0.005 +0.271 }}
* [[CWE]]: ~2 = 1200.0000{{c}}, ~8/5 = 813.1344{{c}}
: error map: {{val| 0.000 +0.135 +0.552 }}
{{Optimal ET sequence|legend=1| 28b, 31, 90, 121, 152, 335, 822, 1157c, 1492c, 2649cc }}
[[Badness]] (Sintel): 9.86


[[Category:31edo]]
[[Category:31edo]]
[[Category:Equivalence continua]]
[[Category:Equivalence continua]]

Latest revision as of 15:18, 25 February 2026

The syntonic–31 equivalence continuum is a continuum of 5-limit temperaments which equate a number of syntonic commas (81/80) with a 31-comma ([-49 31⟩). This continuum is theoretically interesting in that these are all 5-limit temperaments supported by 31edo.

All temperaments in the continuum satisfy (81/80)n ~ [-49 31⟩. Varying n results in different temperaments listed in the table below. It converges to meantone as n approaches infinity. If we allow non-integer and infinite n, the continuum describes the set of all 5-limit temperaments supported by 31edo due to it being the unique equal temperament that tempers out both commas and thus tempers out all combinations of them. The just value of n is approximately 7.46781…, and temperaments having n near this value tend to be the most accurate ones.

Temperaments in the continuum
n Temperament Comma
Ratio Monzo
0 31-commatic [-49 31⟩
1 31 & 12c [-45 27 1⟩
2 Quasimoha 2353579470675/2199023255552 [-41 23 2⟩
3 Oncle 145282683375/137438953472 [-37 19 3⟩
4 Sentinel 8968066875/8589934592 [-33 15 4⟩
5 Tritonic 553584375/536870912 [-29 11 5⟩
6 Ampersand 34171875/33554432 [-25 7 6⟩
7 Orson 2109375/2097152 [-21 3 7⟩
8 Würschmidt 393216/390625 [17 1 -8⟩
9 Valentine 1990656/1953125 [13 5 -9⟩
10 Mynic 10077696/9765625 [9 9 -10⟩
11 Nusecond 51018336/48828125 [5 13 -11⟩
12 Cypress 258280326/244140625 [1 17 -12⟩
13 Diesic 10460353203/9765625000 [-3 21 -13⟩
14 31 & 13c 847288609443/781250000000 [-7 25 -14⟩
… … … …
∞ Meantone 81/80 [-4 4 -1⟩

Examples of temperaments with fractional values of n:

Notable temperaments of fractional n
Temperament n Comma
Slender 13/2 = 6.5 [-46 10 13⟩
Eris 29/4 = 7.25 [-80 8 29⟩
Tertiaseptal 22/3 = 7.3 [-59 5 22⟩
Luna 15/2 = 7.5 [38 -2 -15⟩
Quasiorwell 38/5 = 7.6 [93 -3 -38⟩
Counterwürschmidt 23/3 = 7.6 [55 -1 -23⟩
Birds 31/4 = 7.75 [72 0 -31⟩
Countermiracle 25/3 = 8.3 [47 7 -25⟩
Casablanca 19/2 = 9.5 [22 14 -19⟩

Quadlayo (31 & 12c)

In the chain-of-fifths notation, 5/4 is mapped to the quadruple-diminished fifth (C-Gbbbb).

Subgroup: 2.3.5

Comma list: [-45 27 1⟩

Mapping: [⟨1 0 45], ⟨0 1 -27]]

mapping generators: ~2, ~3

Optimal tunings:

  • WE: ~2 = 1201.6167 ¢, ~3/2 = 697.8886 ¢
error map: ⟨+1.617 -2.450 -0.204]
  • CWE: ~2 = 1200.000 ¢, ~3/2 = 696.9075 ¢
error map: ⟨0.000 -5.048 -2.815]

Optimal ET sequence: 12c, 19c, 31, 136bc, 167bc, 198bc, 229bc

Badness (Sintel): 70.2

The temperament finder - 5-limit 31 & 12c

Ampersand

For extensions, see Gamelismic clan #Miracle.

Ampersand is the 5-limit version of miracle, tempering out the ampersand comma, which is the difference between a perfect fifth and a stack of six classical diatonic semitones. It can be described as the 31 & 41 temperament, corresponding to n = 6.

Subgroup: 2.3.5

Comma list: 34171875/33554432

Mapping: [⟨1 1 3], ⟨0 6 -7]]

mapping generators: ~2, ~16/15

Optimal tunings:

  • WE: ~2 = 1200.8367 ¢, ~16/15 = 116.7546 ¢
error map: ⟨+0.837 -0.591 -1.086]
  • CWE: ~2 = 1200.000 ¢, ~16/15 = 116.6802 ¢
error map: ⟨0.000 -1.874 -3.075]

Optimal ET sequence: 10, 21, 31, 41, 72

Badness (Sintel): 3.89

Valentine (5-limit)

For extensions, see Gamelismic clan #Valentine.

The 5-limit version of valentine tempers out the valentine comma, which is the difference between a perfect fifth and a stack of nine classical chromatic semitones. It can be described as the 31 & 46 temperament, corresponding to n = 9.

Subgroup: 2.3.5

Comma list: 1990656/1953125

Mapping: [⟨1 1 2], ⟨0 9 5]]

mapping generators: ~2, ~25/24

Optimal tunings:

  • WE: ~2 = 1199.3579 ¢, ~25/24 = 77.9973 ¢
error map: ⟨-0.642 -0.621 +2.389]
  • CWE: ~2 = 1200.0000 ¢, ~25/24 = 77.9807 ¢
error map: ⟨0.000 -0.129 +3.590]

Optimal ET sequence: 15, 31, 46, 77, 123

Badness (Sintel): 2.88

Quadlaleyo (31 & 70c)

Subgroup: 2.3.5

Comma list: [-54 18 11⟩

Mapping: [⟨1 -8 18], ⟨0 11 -18]]

mapping generators: ~2, ~30375/16384

Optimal tunings:

  • WE: ~2 = 1201.0416 ¢, ~32768/30375 = 1046.3102 ¢
error map: ⟨+1.042 -0.876 -1.149]
  • CWE: ~2 = 1200.0000 ¢, ~32768/30375 = 1045.4008 ¢
error map: ⟨0.000 -2.546 -3.529]

Optimal ET sequence: 8c, 31, 101c, 132, 163

Badness (Sintel): 48.5

The temperament finder - 5-limit 31 & 70c

Lalasepbigu (31 & 13c)

Subgroup: 2.3.5

Comma list: 847288609443/781250000000

Mapping: [⟨1 -7 -13], ⟨0 14 25]]

mapping generators: ~2, ~19683/12500

Optimal tunings:

  • WE: ~2 = 1200.3614 ¢, ~19683/12500 = 735.7984 ¢
error map: ⟨+0.361 -3.307 +3.498]
  • CWE: ~2 = 1200.0000 ¢, ~19683/12500 = 735.5950 ¢
error map: ⟨0.000 -3.625 -3.560]

Optimal tuning (POTE): ~2 = 1200.000 ¢, ~25000/19683 = 464.423 ¢

Optimal ET sequence: 13c, 18bc, 31

Badness (Sintel): 49.1

The temperament finder - 5-limit 31 & 13c

Counterwürschmidt

For extensions, see Mirkwai clan #Grendel.

Subgroup: 2.3.5

Comma list: [55 -1 -23⟩

Mapping: [⟨1 -14 3], ⟨0 23 -1]]

mapping generators: ~2, ~8/5

Optimal tunings:

  • WE: ~2 = 1200.0000 ¢, ~8/5 = 813.0556 ¢
error map: ⟨-0.120 +0.005 +0.271]
  • CWE: ~2 = 1200.0000 ¢, ~8/5 = 813.1344 ¢
error map: ⟨0.000 +0.135 +0.552]

Optimal ET sequence: 28b, 31, 90, 121, 152, 335, 822, 1157c, 1492c, 2649cc

Badness (Sintel): 9.86

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