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arXiv 0911.4428math.QAmath.AT
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加框小2-圆盘运算与半直积的形式

Formality of the framed little 2-discs operad and semidirect products

Jeffrey Giansiracusa, Paolo Salvatore

摘要:

证明了加框2-圆盘的运算是形式的。Tamarkin和Kontsevich各自证明了无框架的2-圆盘操作数是形式的。非框架2-圆盘是S^1-空间范畴中的一个操作数,而框架2-圆盘操作数可以通过与圈群形成操作半直积来构造。我们证明的思想是证明Kontsevich的拟同构链与圈作用相容,因此我们本质上可以处处取具有S^1的同调的运算半直积,以获得同调与框架2-圆盘链之间的拟同构链。

英文摘要:

We prove that the operad of framed little 2-discs is formal. Tamarkin and Kontsevich each proved that the unframed 2-discs operad is formal. The unframed 2-discs is an operad in the category of S^1-spaces, and the framed 2-discs operad can be constructed from the unframed 2-discs by forming the operadic semidirect product with the circle group. The idea of our proof is to show that Kontsevich's chain of quasi-isomorphisms is compatible with the circle actions and so one can essentially take the operadic semidirect product with the homology of S^1 everywhere to obtain a chain of quasi-isomorphisms between the homology and the chains of the framed 2-discs.

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