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arXiv 2111.06970math.AT
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通过范和实Witt向量实现实拓扑Hochschild同调

Real topological Hochschild homology via the norm and Real Witt vectors

Case Western Reserve University(凯斯西储大学);Michigan State University(密歇根州立大学);University of Minnesota(明尼苏达大学)

Gabriel Angelini-Knoll, Teena Gerhardt, Michael A. Hill

AI总结:

本文通过范和实Witt向量定义了实拓扑Hochschild同调的代数类比,并给出了相关同调群的显式计算。

摘要:

我们证明实拓扑Hochschild同调可以被描述为从循环群阶2到正交群O(2)的范。从这个视角,我们证明了该范对二面体群阶2m的限制的乘法双余集公式。这指导我们提出了一个新的定义,即具有反自同构的环的实Hochschild同调,我们证明这是实拓扑Hochschild同调的代数类比。利用实Hochschild同调上的额外结构,我们定义了具有反自同构的环的p-典型Witt向量的新理论。最后,我们对m为奇数时的THR(Z)的度零D_{2m}-Mackey functor同调群进行了显式计算。这使用了对一般有限群的求和的Tambara互易公式,这可能有独立价值。

英文摘要:

We prove that Real topological Hochschild homology can be characterized as the norm from the cyclic group of order $2$ to the orthogonal group $O(2)$. From this perspective, we then prove a multiplicative double coset formula for the restriction of this norm to dihedral groups of order $2m$. This informs our new definition of Real Hochschild homology of rings with anti-involution, which we show is the algebraic analogue of Real topological Hochschild homology. Using extra structure on Real Hochschild homology, we define a new theory of $p$-typical Witt vectors of rings with anti-involution. We end with an explicit computation of the degree zero $D_{2m}$-Mackey functor homotopy groups of $\operatorname{THR}(\underline{\mathbb{Z}})$ for $m$ odd. This uses a Tambara reciprocity formula for sums for general finite groups, which may be of independent interest.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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