arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2112.04656math.AT
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具有$\underline{\mathbb{Z}}$ -系数的$C_2$ -曲面的上同调

The cohomology of $C_2$-surfaces with $\underline{\mathbb{Z}}$-coefficients

Christy Hazel

摘要:

令$C_2$表示2阶循环群。我们计算了所有具有常积分系数的$C_2$ -曲面的$RO(C_2)$ -分次上同调.我们表明,当行动是非自由的,答案只取决于属,下表面的定向性,孤立的不动点的数量,平凡的正常束的固定圈的数量,和固定圈与非平凡的正常束的数量。当表面上的行动是免费的,我们的答案只取决于属,底层表面的定向性,是否行动是方向保持与逆转定向的情况下,和其他不变量。

英文摘要:

Let $C_2$ denote the cyclic group of order 2. We compute the $RO(C_2)$-graded cohomology of all $C_2$-surfaces with constant integral coefficients. We show when the action is nonfree, the answer depends only on the genus, the orientability of the underlying surface, the number of isolated fixed points, the number of fixed circles with trivial normal bundles, and the number of fixed circles with nontrivial normal bundles. When the action on the surface is free, we show the answer depends only on the genus, the orientability of the underlying surface, whether the action is orientation preserving versus reversing in the orientable case, and one other invariant.

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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