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In mathematics, the Borromean rings consist of three topological circles which are linked despite the fact that no two of them are linked, i.e. they form a Brunnian link. Although the typical picture of the Borromean rings (see right) may lead one to think the link can be formed from geometrically round circles, the Brunnian property means they cannot (see "References"). It is, however, true that one can use ellipses of arbitrarily small eccentricity (see picture below).
History of origin and depictions
Partial Borromean rings emblems In medieval and renaissance Europe, a number of visual signs are found which consist of three elements which are interlaced together in the same way that the Borromean rings are shown interlaced (in their conventional two-dimensional depiction), but the individual elements are not closed loops. Examples of such symbols are the Snoldelev stone horns and the Diana of Poitiers crescents. Molecular Borromean rings
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