编辑“︁Superparticular數”︁（章节）

==應用==
在[[和聲]]的研究中，許多[[音程]]可以表示為Superparticular數的比例。此時可以用{{link-en|Størmer定理|Størmer's theorem}}找出所有分母及分子均為[[光滑數]]的音程<ref name="hh"/>。<!--

In [[graph theory]], superparticular numbers (or rather, their reciprocals, 1/2, 2/3, 3/4, etc.) arise via the [[Erdős–Stone theorem]] as the possible values of the [[dense graph|upper density]] of an infinite graph.<ref>{{cite journal |last=Erdős |first=P. |authorlink=Paul Erdős |coauthors=[[Arthur Stone (mathematician)|Stone, A. H.]] |year=1946 |title=On the structure of linear graphs |journal=[[Bulletin of the American Mathematical Society]] |volume=52  |pages=1087–1091 |doi=10.1090/S0002-9904-1946-08715-7 |issue=12}}</ref>

These ratios are also important in visual harmony.  Most [[flag]]s of the world's countries have a ratio of 3:2 between their length and height.{{cn|date=January 2013}} [[aspect ratio (image)|Aspect ratios]] of 4:3 and 3:2 are common in [[digital photography]], and aspect ratios of 7:6 and 5:4 are used in [[medium format (film)|medium format]] and [[large format]] photography respectively.{{cn|date=January 2013}}
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