In [[13-limit]] [[Just Intonation]], 15/13 is an interval measuring about 247.7¢. In the language of [[Margo Schulter]], 15/13 is an instance of an [[interseptimal]] interval, as it falls in an ambiguous zone between two septimal extremes -- namely the large major second [[8_7|8/7]] and the small minor third [[7_6|7/6]]. (15/13)*([[13_10|13/10]])=[[3_2|3/2]], which implies that 15/13 and 13/10 make a 3/2 perfect fifth. Thus you can make a [[List of root-3rd-P5 triads in JI|root-3rd-P5]] triad that goes 26:30:39, with a 15/13 "inframinor third" up from the root. When being used as type of second, it is given the name "ultra second" as it is even sharper than 8/7 which is often called a "super major second".
In [[13-limit|13-limit]] [[Just_intonation|Just Intonation]], 15/13 is an interval measuring about 247.7¢. In the language of [[Margo_Schulter|Margo Schulter]], 15/13 is an instance of an [[Interseptimal|interseptimal]] interval, as it falls in an ambiguous zone between two septimal extremes -- namely the large major second [[8/7|8/7]] and the small minor third [[7/6|7/6]]. (15/13)*([[13/10|13/10]])=[[3/2|3/2]], which implies that 15/13 and 13/10 make a 3/2 perfect fifth. Thus you can make a [[List_of_root-3rd-P5_triads_in_JI|root-3rd-P5]] triad that goes 26:30:39, with a 15/13 "inframinor third" up from the root. When being used as type of second, it is given the name "ultra second" as it is even sharper than 8/7 which is often called a "super major second".
See: [[Gallery of Just Intervals]], [[The Archipelago]]</pre></div>
See: [[Gallery_of_Just_Intervals|Gallery of Just Intervals]], [[The_Archipelago|The Archipelago]] [[Category:13-limit]]
In <a class="wiki_link" href="/13-limit">13-limit</a> <a class="wiki_link" href="/Just%20Intonation">Just Intonation</a>, 15/13 is an interval measuring about 247.7¢. In the language of <a class="wiki_link" href="/Margo%20Schulter">Margo Schulter</a>, 15/13 is an instance of an <a class="wiki_link" href="/interseptimal">interseptimal</a> interval, as it falls in an ambiguous zone between two septimal extremes -- namely the large major second <a class="wiki_link" href="/8_7">8/7</a> and the small minor third <a class="wiki_link" href="/7_6">7/6</a>. (15/13)*(<a class="wiki_link" href="/13_10">13/10</a>)=<a class="wiki_link" href="/3_2">3/2</a>, which implies that 15/13 and 13/10 make a 3/2 perfect fifth. Thus you can make a <a class="wiki_link" href="/List%20of%20root-3rd-P5%20triads%20in%20JI">root-3rd-P5</a> triad that goes 26:30:39, with a 15/13 &quot;inframinor third&quot; up from the root. When being used as type of second, it is given the name &quot;ultra second&quot; as it is even sharper than 8/7 which is often called a &quot;super major second&quot;. <br />
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See: <a class="wiki_link" href="/Gallery%20of%20Just%20Intervals">Gallery of Just Intervals</a>, <a class="wiki_link" href="/The%20Archipelago">The Archipelago</a></body></html></pre></div>
In 13-limitJust Intonation, 15/13 is an interval measuring about 247.7¢. In the language of Margo Schulter, 15/13 is an instance of an interseptimal interval, as it falls in an ambiguous zone between two septimal extremes -- namely the large major second 8/7 and the small minor third 7/6. (15/13)*(13/10)=3/2, which implies that 15/13 and 13/10 make a 3/2 perfect fifth. Thus you can make a root-3rd-P5 triad that goes 26:30:39, with a 15/13 "inframinor third" up from the root. When being used as type of second, it is given the name "ultra second" as it is even sharper than 8/7 which is often called a "super major second".