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单词 Unknot
释义

unknot


The unknot is the knot with a projection containing no crossings, or equivalently the knot with three vertices. The unknot forms an identity when working with the connected sumMathworldPlanetmathPlanetmath of knots; that is, if U is the unknot, then K=K#U for any knot K.

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更新时间:2025/5/4 21:55:38