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单词 Tangle
释义

tangle


A tangle is a 1-manifoldMathworldPlanetmath, i.e. a disjoint unionMathworldPlanetmathPlanetmath of arcs and circles, embedded in (0,1)2×[0,1]. The boundary of a tangle is contained in (0,1)2×{0,1}. Two tangles are considered equivalentMathworldPlanetmathPlanetmathPlanetmathPlanetmathPlanetmath if and only if they are ambient isotopic relative to their boundaries. Combinatorially, tangles can be understood as tangle diagrams. Any two tangle diagrams which represent the same tangle can be connectedPlanetmathPlanetmath by Reidemeister movesMathworldPlanetmath. This is the content of a slight generalizationPlanetmathPlanetmath of Reidemeister’s theorem. Algebraically, tangles form the morphismsMathworldPlanetmathPlanetmath of a tortile monoidal category. This is a corollary of Shum’s theorem. Specifically, they form the tortile monoidal category generated by a self-dual,unframed object.

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更新时间:2025/5/5 2:42:47