括号多项式

纽结图${\displaystyle L}$ 的括号多项式是 ${\displaystyle \langle L\rangle }$ ：

• ${\displaystyle \langle O\rangle =1}$ ， ${\displaystyle O}$  是平凡纽结
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• ${\displaystyle \langle O\cup L\rangle =(-A^{2}-A^{-2})\langle L\rangle }$ 

• Louis H. Kauffman, State models and the Jones polynomial. Topology 26 (1987), no. 3, 395--407. (introduces the bracket polynomial)

• 埃里克·韦斯坦因. Bracket Polynomial. MathWorld.