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Non radical intervals with musical significance: Difference between revisions

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<h2>IMPORTED REVISION FROM WIKISPACES</h2>
Musicians are typically interested in musical intervals that are rational (i.e. justly intoned ratios), or equal divisions of these intervals. However, not all intervals fit into this box.
This is an imported revision from Wikispaces. The revision metadata is included below for reference:<br>
: This revision was by author [[User:Sarzadoce|Sarzadoce]] and made on <tt>2016-07-10 20:01:53 UTC</tt>.<br>
: The original revision id was <tt>586762957</tt>.<br>
: The revision comment was: <tt></tt><br>
The revision contents are below, presented both in the original Wikispaces Wikitext format, and in HTML exactly as Wikispaces rendered it.<br>
<h4>Original Wikitext content:</h4>
<div style="width:100%; max-height:400pt; overflow:auto; background-color:#f8f9fa; border: 1px solid #eaecf0; padding:0em"><pre style="margin:0px;border:none;background:none;word-wrap:break-word;white-space: pre-wrap ! important" class="old-revision-html">Musicians are typically interested in musical intervals that are rational (i.e. justly intoned ratios), or equal divisions of these intervals. However, not all intervals fit into this box.


There are many non-radical intervals which have musical significance. By **non-radical** is meant a number that cannot be written in the form [[math]] a^{1/b} [[math]], where a and b are integers. What follows is a list of musically significant non-radical intervals.
There are many non-radical intervals which have musical significance. By '''non-radical''' is meant a number that cannot be written in the form [[math|math]] a^{1/b} [[math|math]], where a and b are integers. What follows is a list of musically significant non-radical intervals.


|| **Ratio** || **Cents** || **Name** || **Musical Significance** ||
{| class="wikitable"
|| [[math]]
|-
2^{1/\phi}
| | '''Ratio'''
| | '''Cents'''
| | '''Name'''
| | '''Musical Significance'''
|-
| | <math>2^{1/\phi}
\approx
\approx
1.5348
1.5348</math>
[[math]] || 741.64 ||   || "Logarithmic phi" which divides the octave into two parts, one being Phi times larger than the other in cents. ||
| | 741.64
|| [[math]]
| |  
\dfrac{\sqrt{5}+1}{2}
| | "Logarithmic phi" which divides the octave into two parts, one being Phi times larger than the other in cents.
|-
| | <math>\dfrac{\sqrt{5}+1}{2}
\approx
\approx
1.6180
1.6180</math>
[[math]] || 833.09 || [[math]]
| | 833.09
\text{Phi } (\phi)
| | <math>\text{Phi } (\phi)</math>
[[math]] || "Linear phi," the unique interval whose continued fraction approximations converge more slowly than any other number. This is due to the continued fraction representation only containing 1's, as well as a general consequence of [[https://en.wikipedia.org/wiki/Diophantine_approximation#General_upper_bound|Dirichlet's Approximation Theorem]]. ||
| | "Linear phi," the unique interval whose continued fraction approximations converge more slowly than any other number. This is due to the continued fraction representation only containing 1's, as well as a general consequence of [https://en.wikipedia.org/wiki/Diophantine_approximation#General_upper_bound Dirichlet's Approximation Theorem].
|| [[math]]
|-
e \approx 2.7183
| | <math>e \approx 2.7183</math>
[[math]] || 1731.23 || "e-tave" || In Gene's black magic formulas, it is mathematically more "natural" to consider the number of divisions to the "e-tave" rather than the octave. ||
| | 1731.23
|| [[math]]
| | "e-tave"
e^{2\pi} \approx 535.4917
| | In Gene's black magic formulas, it is mathematically more "natural" to consider the number of divisions to the "e-tave" rather than the octave.
[[math]] || 10877.66 ||   || The zeta function has units that are given as divisions of the interval
|-
[[math]]
| | <math>e^{2\pi} \approx 535.4917</math>
e^{2\pi}
| | 10877.66
[[math]] ||</pre></div>
| |  
<h4>Original HTML content:</h4>
| | The zeta function has units that are given as divisions of the interval
<div style="width:100%; max-height:400pt; overflow:auto; background-color:#f8f9fa; border: 1px solid #eaecf0; padding:0em"><pre style="margin:0px;border:none;background:none;word-wrap:break-word;width:200%;white-space: pre-wrap ! important" class="old-revision-html">&lt;html&gt;&lt;head&gt;&lt;title&gt;Non radical intervals with musical significance&lt;/title&gt;&lt;/head&gt;&lt;body&gt;Musicians are typically interested in musical intervals that are rational (i.e. justly intoned ratios), or equal divisions of these intervals. However, not all intervals fit into this box.&lt;br /&gt;
&lt;br /&gt;
There are many non-radical intervals which have musical significance. By &lt;strong&gt;non-radical&lt;/strong&gt; is meant a number that cannot be written in the form &lt;a class="wiki_link" href="/math"&gt;math&lt;/a&gt; a^{1/b} &lt;a class="wiki_link" href="/math"&gt;math&lt;/a&gt;, where a and b are integers. What follows is a list of musically significant non-radical intervals.&lt;br /&gt;
&lt;br /&gt;


 
<math>e^{2\pi}</math>
&lt;table class="wiki_table"&gt;
|}
    &lt;tr&gt;
        &lt;td&gt;&lt;strong&gt;Ratio&lt;/strong&gt;&lt;br /&gt;
&lt;/td&gt;
        &lt;td&gt;&lt;strong&gt;Cents&lt;/strong&gt;&lt;br /&gt;
&lt;/td&gt;
        &lt;td&gt;&lt;strong&gt;Name&lt;/strong&gt;&lt;br /&gt;
&lt;/td&gt;
        &lt;td&gt;&lt;strong&gt;Musical Significance&lt;/strong&gt;&lt;br /&gt;
&lt;/td&gt;
    &lt;/tr&gt;
    &lt;tr&gt;
        &lt;td&gt;&lt;!-- ws:start:WikiTextMathRule:0:
[[math]]&amp;lt;br/&amp;gt;
2^{1/\phi}&amp;lt;br /&amp;gt;
\approx&amp;lt;br /&amp;gt;
1.5348&amp;lt;br/&amp;gt;[[math]]
--&gt;&lt;script type="math/tex"&gt;2^{1/\phi}
\approx
1.5348&lt;/script&gt;&lt;!-- ws:end:WikiTextMathRule:0 --&gt;&lt;br /&gt;
&lt;/td&gt;
        &lt;td&gt;741.64&lt;br /&gt;
&lt;/td&gt;
        &lt;td&gt;&lt;br /&gt;
&lt;/td&gt;
        &lt;td&gt;&amp;quot;Logarithmic phi&amp;quot; which divides the octave into two parts, one being Phi times larger than the other in cents.&lt;br /&gt;
&lt;/td&gt;
    &lt;/tr&gt;
    &lt;tr&gt;
        &lt;td&gt;&lt;!-- ws:start:WikiTextMathRule:1:
[[math]]&amp;lt;br/&amp;gt;
\dfrac{\sqrt{5}+1}{2}&amp;lt;br /&amp;gt;
\approx&amp;lt;br /&amp;gt;
1.6180&amp;lt;br/&amp;gt;[[math]]
--&gt;&lt;script type="math/tex"&gt;\dfrac{\sqrt{5}+1}{2}
\approx
1.6180&lt;/script&gt;&lt;!-- ws:end:WikiTextMathRule:1 --&gt;&lt;br /&gt;
&lt;/td&gt;
        &lt;td&gt;833.09&lt;br /&gt;
&lt;/td&gt;
        &lt;td&gt;&lt;!-- ws:start:WikiTextMathRule:2:
[[math]]&amp;lt;br/&amp;gt;
\text{Phi } (\phi)&amp;lt;br/&amp;gt;[[math]]
--&gt;&lt;script type="math/tex"&gt;\text{Phi } (\phi)&lt;/script&gt;&lt;!-- ws:end:WikiTextMathRule:2 --&gt;&lt;br /&gt;
&lt;/td&gt;
        &lt;td&gt;&amp;quot;Linear phi,&amp;quot; the unique interval whose continued fraction approximations converge more slowly than any other number. This is due to the continued fraction representation only containing 1's, as well as a general consequence of &lt;a class="wiki_link_ext" href="https://en.wikipedia.org/wiki/Diophantine_approximation#General_upper_bound" rel="nofollow"&gt;Dirichlet's Approximation Theorem&lt;/a&gt;.&lt;br /&gt;
&lt;/td&gt;
    &lt;/tr&gt;
    &lt;tr&gt;
        &lt;td&gt;&lt;!-- ws:start:WikiTextMathRule:3:
[[math]]&amp;lt;br/&amp;gt;
e \approx 2.7183&amp;lt;br/&amp;gt;[[math]]
--&gt;&lt;script type="math/tex"&gt;e \approx 2.7183&lt;/script&gt;&lt;!-- ws:end:WikiTextMathRule:3 --&gt;&lt;br /&gt;
&lt;/td&gt;
        &lt;td&gt;1731.23&lt;br /&gt;
&lt;/td&gt;
        &lt;td&gt;&amp;quot;e-tave&amp;quot;&lt;br /&gt;
&lt;/td&gt;
        &lt;td&gt;In Gene's black magic formulas, it is mathematically more &amp;quot;natural&amp;quot; to consider the number of divisions to the &amp;quot;e-tave&amp;quot; rather than the octave.&lt;br /&gt;
&lt;/td&gt;
    &lt;/tr&gt;
    &lt;tr&gt;
        &lt;td&gt;&lt;!-- ws:start:WikiTextMathRule:4:
[[math]]&amp;lt;br/&amp;gt;
e^{2\pi} \approx 535.4917&amp;lt;br/&amp;gt;[[math]]
--&gt;&lt;script type="math/tex"&gt;e^{2\pi} \approx 535.4917&lt;/script&gt;&lt;!-- ws:end:WikiTextMathRule:4 --&gt;&lt;br /&gt;
&lt;/td&gt;
        &lt;td&gt;10877.66&lt;br /&gt;
&lt;/td&gt;
        &lt;td&gt;&lt;br /&gt;
&lt;/td&gt;
        &lt;td&gt;The zeta function has units that are given as divisions of the interval&lt;br /&gt;
&lt;!-- ws:start:WikiTextMathRule:5:
[[math]]&amp;lt;br/&amp;gt;
e^{2\pi}&amp;lt;br/&amp;gt;[[math]]
--&gt;&lt;script type="math/tex"&gt;e^{2\pi}&lt;/script&gt;&lt;!-- ws:end:WikiTextMathRule:5 --&gt;&lt;br /&gt;
&lt;/td&gt;
    &lt;/tr&gt;
&lt;/table&gt;
 
&lt;/body&gt;&lt;/html&gt;</pre></div>
Retrieved from "https://en.xen.wiki/w/Non_radical_intervals_with_musical_significance"