Aberrismic theory: Difference between revisions

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At times, a scale pattern has varying temperaments according to the tuning. For example, 5L2m3s may be given the temperament structure of either untempered 2.3.5 or [[Ultrapyth]] temperament.

Mathematically, this difference corresponds to choices of <math>\mathbb{Z}</math>-linear maps

<math>\alpha : \mathbb{Z}^3\langle\mathbf{L}, \mathbf{m}, \mathbf{s}\rangle \to \mathrm{JI}( 2, p_1, ..., p_s )/\mathrm{ker}(T)</math> (here <math>T</math> is a temperament map defined on the 2.p1....ps subgroup), determined by differing choices of <math>\alpha(\mathbf{L}), \alpha(\mathbf{m}), \alpha(\mathbf{s})</math> and subject to the constraint that <math>5\alpha(\mathbf{L}) + 2\alpha(\mathbf{m}) + 3\alpha(\mathbf{s}) = T(2).</math> Technically, there are two "degrees of freedom", namely the choice of temperament and the choice of where to map the scale steps. The assignments of scale steps to tempered intervals is chosen to improve coverage of important LCJI intervals.

=== Example: blackdye ===

The following table shows two different temperament interpretations for the same aberrismic scale pattern blackdye (sLmLsLmLsL), under untempered 2.3.5 and Ultrapyth respectively.

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~~Mathematically, this difference corresponds to choices of <math>\mathbb{Z}</math>-linear maps~~

<math>\alpha : \mathbb{Z}^3\langle\mathbf{L}, \mathbf{m}, \mathbf{s}\rangle \to \mathrm{JI}( 2, p_1, ..., p_s )/\mathrm{ker}(T)</math> (here <math>T</math> is a temperament map defined on the 2.p1....ps subgroup), determined by differing choices of <math>\alpha(\mathbf{L}), \alpha(\mathbf{m}), \alpha(\mathbf{s})</math> and subject to the constraint that <math>5\alpha(\mathbf{L}) + 2\alpha(\mathbf{m}) + 3\alpha(\mathbf{s}) = T(2).</math>

== Code ==

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 At times, a scale pattern has varying temperaments according to the tuning. For example, 5L2m3s may be given the temperament structure of either untempered 2.3.5 or [[Ultrapyth]] temperament.
+Mathematically, this difference corresponds to choices of <math>\mathbb{Z}</math>-linear maps
+<math>\alpha : \mathbb{Z}^3\langle\mathbf{L}, \mathbf{m}, \mathbf{s}\rangle \to \mathrm{JI}( 2, p_1, ..., p_s )/\mathrm{ker}(T)</math> (here <math>T</math> is a temperament map defined on the 2.p<sub>1</sub>....p<sub>s</sub> subgroup), determined by differing choices of <math>\alpha(\mathbf{L}), \alpha(\mathbf{m}), \alpha(\mathbf{s})</math> and subject to the constraint that <math>5\alpha(\mathbf{L}) + 2\alpha(\mathbf{m}) + 3\alpha(\mathbf{s}) = T(2).</math> Technically, there are two "degrees of freedom", namely the choice of temperament and the choice of where to map the scale steps. The assignments of scale steps to tempered intervals is chosen to improve coverage of important LCJI intervals.
 === Example: blackdye ===
 The following table shows two different temperament interpretations for the same aberrismic scale pattern blackdye (sLmLsLmLsL), under untempered 2.3.5 and Ultrapyth respectively.
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 | 143/80<br/>21/11<br/>280/143
 |}
-Mathematically, this difference corresponds to choices of <math>\mathbb{Z}</math>-linear maps
-<math>\alpha : \mathbb{Z}^3\langle\mathbf{L}, \mathbf{m}, \mathbf{s}\rangle \to \mathrm{JI}( 2, p_1, ..., p_s )/\mathrm{ker}(T)</math> (here <math>T</math> is a temperament map defined on the 2.p<sub>1</sub>....p<sub>s</sub> subgroup), determined by differing choices of <math>\alpha(\mathbf{L}), \alpha(\mathbf{m}), \alpha(\mathbf{s})</math> and subject to the constraint that <math>5\alpha(\mathbf{L}) + 2\alpha(\mathbf{m}) + 3\alpha(\mathbf{s}) = T(2).</math> <!--Technically, there are two "degrees of freedom", namely the choice of temperament and the choice of where to map the scale steps. The assignments of scale steps to tempered intervals is chosen to maximize coverage of important LCJI intervals.-->
 == Code ==