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unlink : ウィキペディア英語版
unlink

In the mathematical field of knot theory, the unlink is a link that is equivalent (under ambient isotopy) to finitely many disjoint circles in the plane.
== Properties ==

* An ''n''-component link ''L'' ⊂ S3 is an unlink if and only if there exists ''n'' disjointly embedded discs ''D''''i'' ⊂ S3 such that ''L'' = ∪''i''∂''D''''i''.
* A link with one component is an unlink if and only if it is the unknot.
* The link group of an ''n''-component unlink is the free group on ''n'' generators, and is used in classifying Brunnian links.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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