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Grothendieck-Teichmüller羣係種辮羣外自同構嘅推廣、完備化;Drinfeld響渠1990年(英譯:1991年)嘅論文[1] 度提出,來研究擬三角擬Hopf代數嘅對稱結構[2]。
設
設
由符合下列方程嘅序對(λ,f)組成:
_GT_(k)嘅可逆元就組成一羣,記做GT(k);Drinfeld叫渠做Grothendieck-Teichmüller羣。
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