Gallery of omnitetrachordal scales: Difference between revisions

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'''"Dual"''' refers to the "inverse" of a L+s scale pattern, where every L is replaced by s, and vice versa. For example, <tt> sLssL </tt> and <tt> LsLLs </tt> are duals. If a scale is OTC, its dual is often OTC as well, but not always!

'''"Perfect"''' means that values for L and s exist such that L > s and that every mode of the scale will contain a perfect (just) 3/2 or 4/3 (or both). (See also [[Eigenmonzo_subgroup|Eigenmonzo subgroup]].)

'''"Perfect"''' means that values for L and s exist such that L > s and that every mode of the scale will contain a perfect (just) 3/2 or 4/3 (or both). (See also [[Eigenmonzo_subgroup|Eigenmonzo subgroup]], or [[unchanged-interval basis]].)

In this case the value '''P''' is given, where P = L/s. For a perfect scale, P > 1. Note that if a scale "a" is perfect (Pa = L/s), its dual "b" will have the value Pb = s/L = 1/Pa, and therefore must be imperfect (if Pa > 1, then Pb < 1 ).

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 '''"Dual"''' refers to the "inverse" of a L+s scale pattern, where every L is replaced by s, and vice versa.  For example, <tt> sLssL </tt> and <tt> LsLLs </tt> are duals.  If a scale is OTC, its dual is often OTC as well, but not always!
-'''"Perfect"''' means that values for L and s exist such that L &gt; s and that every mode of the scale will contain a perfect (just) 3/2 or 4/3 (or both).  (See also [[Eigenmonzo_subgroup|Eigenmonzo subgroup]].)
+'''"Perfect"''' means that values for L and s exist such that L &gt; s and that every mode of the scale will contain a perfect (just) 3/2 or 4/3 (or both).  (See also [[Eigenmonzo_subgroup|Eigenmonzo subgroup]], or [[unchanged-interval basis]].)
 In this case the value '''P''' is given, where P = L/s.  For a perfect scale, P &gt; 1.  Note that if a scale "a" is perfect (P<span style="vertical-align: sub;">a</span> = L/s), its dual "b" will have the value P<span style="vertical-align: sub;">b</span> = s/L = 1/P<span style="vertical-align: sub;">a</span>, and therefore must be imperfect (if P<span style="vertical-align: sub;">a</span> &gt; 1, then P<span style="vertical-align: sub;">b</span> &lt; 1 ).