Dicot family: Difference between revisions

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Expanded overview to extensions
→Dicot: - links to geryon ({8/7, 25/21}, deleted), replace with ternary and quad
 
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== Dicot ==
== Dicot ==
{{Redirect|Dicot|the ploidacot signature|Ploidacot/Dicot}}
{{Main| Dicot }}


The head of this family, dicot, is [[generator|generated]] by a classical third (major and minor mean the same thing), and two such thirds give a fifth. In fact, {{nowrap|(5/4)<sup>2</sup> {{=}} (3/2)(25/24)}}. Its [[ploidacot]] is the same as its name, dicot.  
The head of this family, dicot, is [[generator|generated]] by a classical third (major and minor mean the same thing), and two such thirds give a fifth. In fact, {{nowrap|(5/4)<sup>2</sup> {{=}} (3/2)(25/24)}}. Its [[ploidacot]] is the same as its name, dicot.  
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{{Mapping|legend=1| 1 1 2 | 0 2 1 }}
{{Mapping|legend=1| 1 1 2 | 0 2 1 }}
: mapping generators: ~2, ~5/4
: mapping generators: ~2, ~5/4


[[Optimal tuning]]s:  
[[Optimal tuning]]s:  
* [[WE]]: ~2 = 1206.283{{c}}, ~6/5 = 350.420{{c}}
* [[WE]]: ~2 = 1206.283{{c}}, ~5/4 = 350.420{{c}}
: [[error map]]: {{val| +6.283 +5.167 -23.328 }}
: [[error map]]: {{val| +6.283 +5.167 -23.328 }}
* [[CWE]]: ~2 = 1200.000{{c}}, ~5/4 = 351.086{{c}}
* [[CWE]]: ~2 = 1200.000{{c}}, ~5/4 = 351.086{{c}}
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=== Overview to extensions ===
=== Overview to extensions ===
The dicot comma, 25/24, factors into the 7-limit as ([[49/48]])([[50/49]]). Since [[49/48]] is the difference between [[8/7]] and [[7/6]], and [[50/49]] is the difference between [[7/5]] and [[10/7]], it makes the most sense to temper out both of them, leading to decimal. In the 11-limit, we have the identity 25/24=([[45/44]])([[55/54]]), but also 50/49=([[99/98]])([[100/99]]), so it makes sense to temper out all of them. That interestingly leads to a rank-1 temperament, the 14c val of [[14edo]]. However, since dicot is an exotemperament anyway, the other extensions should also be considered.
==== 7-limit extensions ====
The second comma of the comma list defines which [[7-limit]] family member we are looking at. Mujannabic adds [[36/35]], flattie adds [[21/20]], sharpie adds [[28/27]], and dichotic adds [[64/63]], all retaining the same period and generator.
 
The dicot comma, 25/24, factors into the 7-limit as ([[49/48]])⋅([[50/49]]). Since [[49/48]] is the difference between [[8/7]] and [[7/6]], and [[50/49]] is the difference between [[7/5]] and [[10/7]], it makes sense to extend dicot to temper them all out, leading to decimal, a weak extension where the octave and twelfth are split in halves. Other weak extensions include sidi, which adds [[245/243]], and jamesbond, which adds [[16/15]]. Here sidi uses 14/9 as a generator, with two of them making up the combined [[5/2]][[~]][[12/5]] neutral tenth. Jamesbond has a period of 1/7 octave, and uses an approximate 15/14 as generator.


The second comma of the [[normal lists|normal comma list]] defines which [[7-limit]] family member we are looking at. Septimal dicot adds [[36/35]], flattie adds [[21/20]], sharpie adds [[28/27]], and dichotic adds [[64/63]], all retaining the same period and generator.
Temperaments discussed elsewhere are:
* ''[[Ternary]]'' → [[Very low accuracy temperaments #Ternary|Very low accuracy temperaments]]
* ''[[Quad]]'' → [[Very low accuracy temperaments #Quad|Very low accuracy temperaments]]
* ''[[Jamesbond]]'' → [[Whitewood family #Jamesbond|Whitewood family]]


Decimal adds [[49/48]], sidi adds [[245/243]], and jamesbond adds [[16/15]]. Here decimal divides the [[period]] to a [[sqrt(2)|semi-octave]], and sidi uses 14/9 as a generator, with two of them making up the combined 5/2~12/5 neutral tenth. Jamesbond has a period of 1/7 octave, and uses an approximate 15/14 as generator.
The rest are considered in each sections below.


Temperaments discussed elsewhere are:
==== Subgroup extensions ====
* ''[[Geryon]]'' → [[Very low accuracy temperaments #Geryon|Very low accuracy temperaments]]
In the 11-limit, we have the identity 25/24 = ([[45/44]])⋅([[55/54]]), so it makes sense to temper out all of them. This leads to the very natural subgroup temperament where [[11/9]]~[[27/22]] is mapped to the neutral third. As such, this is also the path that most of the septimal extensions take to get their 11-limit versions.
* ''[[Jamesbond]]'' → [[7th-octave temperaments #Jamesbond|7th-octave temperaments]]


The rest are considered below.  
An alternative identity is 25/24 = ([[33/32]])⋅([[100/99]]), and tempering out these commas leads to the 2.3.5.11-subgroup restriction of some of the temperaments below.


=== 2.3.5.11 subgroup ===
=== 2.3.5.11 subgroup ===
The 2.3.5.11-subgroup extension maps [[11/9]]~[[27/22]] to the neutral third. As such, it is related to most of the septimal extensions.
Subgroup: 2.3.5.11
Subgroup: 2.3.5.11


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Subgroup val mapping: {{mapping| 1 1 2 2 | 0 2 1 5 }}
Subgroup val mapping: {{mapping| 1 1 2 2 | 0 2 1 5 }}


Gencom mapping: {{mapping| 1 1 2 0 2 | 0 2 1 0 5 }}
{{Mapping|legend=4| 1 1 2 0 2 | 0 2 1 0 5 }}


Optimal tunings:  
Optimal tunings:  
* WE: ~2 = 1206.750{{c}}, ~6/5 = 348.684{{c}}
* WE: ~2 = 1206.750{{c}}, ~5/4 = 348.684{{c}}
* CWE: ~2 = 1200.000{{c}}, ~6/5 = 348.954{{c}}
* CWE: ~2 = 1200.000{{c}}, ~5/4 = 348.954{{c}}


{{Optimal ET sequence|legend=0| 3e, 4e, 7, 24c, 31c }}
{{Optimal ET sequence|legend=0| 3e, 4e, 7, 24c, 31c }}
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Subgroup val mapping: {{mapping| 1 1 2 2 4 | 0 2 1 5 -1 }}
Subgroup val mapping: {{mapping| 1 1 2 2 4 | 0 2 1 5 -1 }}


Gencom mapping: {{mapping| 1 1 2 0 2 4 | 0 2 1 0 5 -1 }}
{{Mapping|legend=4| 1 1 2 0 2 4 | 0 2 1 0 5 -1 }}


Optimal tunings:  
Optimal tunings:  
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Badness (Sintel): 0.536
Badness (Sintel): 0.536


== Septimal dicot ==
== Mujannabic ==
Septimal dicot is the extension where [[7/6]] and [[9/7]] are also conflated into 5/4~6/5. Although 5/4~6/5 covers a giant block of pitches already, 7/6 and 9/7 are often considered as thirds too. On that account one could argue for the canonicity of this extension, despite the relatively poor accuracy.  
Mujannabic extends dicot such that [[7/6]] and [[9/7]] are also conflated with 5/4~6/5. Although 5/4–6/5 covers a giant block of pitches already, 7/6 and 9/7 are often considered as thirds too. On that account one could argue for the utility of this extension despite the relatively poor accuracy.
 
Mujannabic was known as ''septimal dicot'' in earlier materials such as [[Graham Breed]]'s [https://x31eq.com/temper/ Temperament Finder].  


[[Subgroup]]: 2.3.5.7
[[Subgroup]]: 2.3.5.7
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Comma list: 15/14, 22/21, 25/24
Comma list: 15/14, 22/21, 25/24


Mapping: {{mapping| 1 1 2 2 2 | 0 2 1 3 5 }}
{{Mapping|legend=0| 1 1 2 2 2 | 0 2 1 3 5 }}


Optimal tunings:  
Optimal tunings:  
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Comma list: 15/14, 25/24, 33/32
Comma list: 15/14, 25/24, 33/32


Mapping: {{mapping| 1 1 2 2 4 | 0 2 1 3 -2 }}
{{Mapping|legend=0| 1 1 2 2 4 | 0 2 1 3 -2 }}


Optimal tunings:  
Optimal tunings:  
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Comma list: 15/14, 25/24, 33/32, 40/39
Comma list: 15/14, 25/24, 33/32, 40/39


Mapping: {{mapping| 1 1 2 2 4 4 | 0 2 1 3 -2 -1 }}
{{Mapping|legend=0| 1 1 2 2 4 4 | 0 2 1 3 -2 -1 }}


Optimal tunings:  
Optimal tunings:  
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== Flattie ==
== Flattie ==
This temperament used to be known as ''flat''. Unlike septimal dicot where 7/6 is added to the neutral third, here [[8/7]] is added instead.  
This temperament used to be known as ''flat''. Unlike mujannabic where 7/6 is added to the neutral third, here [[8/7]] is added instead.  


[[Subgroup]]: 2.3.5.7
[[Subgroup]]: 2.3.5.7
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Comma list: 21/20, 25/24, 33/32
Comma list: 21/20, 25/24, 33/32


Mapping: {{mapping| 1 1 2 3 4 | 0 2 1 -1 -2 }}
{{Mapping|legend=0| 1 1 2 3 4 | 0 2 1 -1 -2 }}


Optimal tunings:  
Optimal tunings:  
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Comma list: 14/13, 21/20, 25/24, 33/32
Comma list: 14/13, 21/20, 25/24, 33/32


Mapping: {{mapping| 1 1 2 3 4 4 | 0 2 1 -1 -2 -1 }}
{{Mapping|legend=0| 1 1 2 3 4 4 | 0 2 1 -1 -2 -1 }}


Optimal tunings:  
Optimal tunings:  
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Comma list: 25/24, 28/27, 35/33
Comma list: 25/24, 28/27, 35/33


Mapping: {{mapping| 1 1 2 1 2 | 0 2 1 6 5 }}
{{Mapping|legend=0| 1 1 2 1 2 | 0 2 1 6 5 }}


Optimal tunings:  
Optimal tunings:  
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Comma list: 25/24, 45/44, 64/63
Comma list: 25/24, 45/44, 64/63


Mapping: {{mapping| 1 1 2 4 2 | 0 2 1 -4 5 }}
{{Mapping|legend=0| 1 1 2 4 2 | 0 2 1 -4 5 }}


Optimal tunings:  
Optimal tunings:  
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Comma list: 25/24, 40/39, 45/44, 64/63
Comma list: 25/24, 40/39, 45/44, 64/63


Mapping: {{mapping| 1 1 2 4 2 4 | 0 2 1 -4 5 -1 }}
{{Mapping|legend=0| 1 1 2 4 2 4 | 0 2 1 -4 5 -1 }}


Optimal tunings:  
Optimal tunings:  
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Comma list: 22/21, 25/24, 33/32
Comma list: 22/21, 25/24, 33/32


Mapping: {{mapping| 1 1 2 4 4 | 0 2 1 -4 -2 }}
{{Mapping|legend=0| 1 1 2 4 4 | 0 2 1 -4 -2 }}


Optimal tunings:  
Optimal tunings:  
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Comma list: 22/21, 25/24, 33/32, 40/39
Comma list: 22/21, 25/24, 33/32, 40/39


Mapping: {{mapping| 1 1 2 4 4 4 | 0 2 1 -4 -2 -1 }}
{{Mapping|legend=0| 1 1 2 4 4 4 | 0 2 1 -4 -2 -1 }}


Optimal tunings:  
Optimal tunings:  
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Comma list: 25/24, 35/33, 64/63
Comma list: 25/24, 35/33, 64/63


Mapping: {{mapping| 1 1 2 4 5 | 0 2 1 -4 -5 }}
{{Mapping|legend=0| 1 1 2 4 5 | 0 2 1 -4 -5 }}


Optimal tunings:  
Optimal tunings:  
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Comma list: 25/24, 35/33, 40/39, 64/63
Comma list: 25/24, 35/33, 40/39, 64/63


Mapping: {{mapping| 1 1 2 4 5 4 | 0 2 1 -4 -5 -1 }}
{{Mapping|legend=0| 1 1 2 4 5 4 | 0 2 1 -4 -5 -1 }}


Optimal tunings:  
Optimal tunings:  
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Decimal tempers out 49/48 and [[50/49]], and has a semi-octave period for 7/5~10/7 and a hemitwelfth generator for 7/4~12/7. Its ploidacot is diploid dicot. [[10edo]] makes for a good tuning, from which it derives its name. [[14edo]] in the 14c val and [[24edo]] in the 24c val are also among the possibilities.  
Decimal tempers out 49/48 and [[50/49]], and has a semi-octave period for 7/5~10/7 and a hemitwelfth generator for 7/4~12/7. Its ploidacot is diploid dicot. [[10edo]] makes for a good tuning, from which it derives its name. [[14edo]] in the 14c val and [[24edo]] in the 24c val are also among the possibilities.  
Decimal can be extended to the 11-limit by the usual path of tempering out 45/44 and 55/54. There is an alternative due to the identity 50/49 = ([[99/98]])⋅([[100/99]]), in which case it also tempers out 33/32. The two mappings meet at the 14c val of [[14edo]].


[[Subgroup]]: 2.3.5.7
[[Subgroup]]: 2.3.5.7
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Comma list: 25/24, 45/44, 49/48
Comma list: 25/24, 45/44, 49/48


Mapping: {{mapping| 2 0 3 4 -1 | 0 2 1 1 5 }}
{{Mapping|legend=0| 2 0 3 4 -1 | 0 2 1 1 5 }}


Optimal tunings:  
Optimal tunings:  
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Comma list: 25/24, 45/44, 49/48, 91/90
Comma list: 25/24, 45/44, 49/48, 91/90


Mapping: {{mapping| 2 0 3 4 -1 1| 0 2 1 1 5 4}}
{{Mapping|legend=0| 2 0 3 4 -1 1| 0 2 1 1 5 4}}


Optimal tunings:  
Optimal tunings:  
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Comma list: 25/24, 33/32, 49/48
Comma list: 25/24, 33/32, 49/48


Mapping: {{mapping| 2 0 3 4 10 | 0 2 1 1 -2 }}
{{Mapping|legend=0| 2 0 3 4 10 | 0 2 1 1 -2 }}


Optimal tunings:  
Optimal tunings:  
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Comma list: 25/24, 35/33, 49/48
Comma list: 25/24, 35/33, 49/48


Mapping: {{mapping| 2 0 3 4 7 | 0 2 1 1 0 }}
{{Mapping|legend=0| 2 0 3 4 7 | 0 2 1 1 0 }}


Optimal tunings:  
Optimal tunings:  
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== Sidi ==
== Sidi ==
Sidi tempers out 245/243, and splits 5/2~12/5 in two. Its ploidacot is beta-tetracot. This relates it to [[squares]], to which it can be used as a simpler alternative. 14edo in the 14c val can be used as a tuning, in which case it is identical to squares, however.  
Sidi tempers out [[245/243]], and splits [[5/2]][[~]][[12/5]] in two. Its [[ploidacot]] is beta-tetracot. This relates it to [[squares]], to which it can be used as a simpler alternative. 14edo in the 14c val can be used as a tuning, in which case it is identical to squares, however.  


[[Subgroup]]: 2.3.5.7
[[Subgroup]]: 2.3.5.7
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Comma list: 25/24, 45/44, 99/98
Comma list: 25/24, 45/44, 99/98


Mapping: {{mapping| 1 -1 1 -3 -3 | 0 4 2 9 10 }}
{{Mapping|legend=0| 1 -1 1 -3 -3 | 0 4 2 9 10 }}


Optimal tunings:  
Optimal tunings:  
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Badness (Sintel): 1.09
Badness (Sintel): 1.09


== Sida ==
Named by [[Xenllium]] in 2026, sida is described as the {{nowrap| 3 & 14c }} temperment, and tempers out [[1323/1280]] and [[4000/3969]]. Its [[ploidacot]] is beta-tetracot, the same as [[#Sidi|sidi]].
[[Subgroup]]: 2.3.5.7
[[Comma list]]: 25/24, 1323/1280
{{Mapping|legend=1| 1 -1 1 6 | 0 4 2 -5 }}
: mapping generators: ~2, ~32/21
[[Optimal tuning]]s:
* [[WE]]: ~2 = 1209.021{{c}}, ~32/21 = 778.298{{c}}
: [[error map]]: {{val| +9.021 +2.216 -20.696 -6.188 }}
* [[CWE]]: ~2 = 1200.000{{c}}, ~32/21 = 772.785{{c}}
: error map: {{val| 0.000 -10.816 -40.744 -32.749 }}
{{Optimal ET sequence|legend=1| 3, 11c, 14c, 45ccdd }}
[[Badness]] (Sintel): 2.12
=== 11-limit ===
Subgroup: 2.3.5.7.11
Comma list: 25/24, 33/32, 245/242
{{Mapping|legend=0| 1 3 3 1 2 | 0 -4 -2 5 4 }}
Optimal tunings:
* WE: ~2 = 1209.621{{c}}, ~11/7 = 772.376{{c}}
* CWE: ~2 = 1200.000{{c}}, ~11/7 = 772.247{{c}}
{{Optimal ET sequence|legend=0| 3, 11c, 14c }}
Badness (Sintel): 1.54
[[Category:Dicot family| ]] <!-- main article -->
[[Category:Temperament families]]
[[Category:Temperament families]]
[[Category:Pages with mostly numerical content]]
[[Category:Catalogs of rank-2 temperaments]]
[[Category:Dicot family| ]] <!-- main article -->
[[Category:Dicot| ]] <!-- key article -->
[[Category:Rank 2]]