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arXiv math/0509621math.GTmath.AT
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一种新的不变参数连通嵌入和

A new invariant and parametric connected sum of embeddings

A. Skopenkov

摘要:

本文定义了流形在欧几里得空间中的嵌入N -> R^m的同痕不变量。这个不变量与Haefliger-Wu的α-不变量在α-不变量可能不完全的维数范围内是完全的。我们还定义了某些嵌入的参数连接和(类似于手术)。这允许获得新的完整性结果的α-不变量和以下估计的同伦类的嵌入。对于分段线性范畴,一个(3 n-2 m +2)-连通的n-流形N和(4 n +4)/3 < m <(3 n +3)/2的每个α-不变量原像注入到H_{3n-2m+3}(N)的一个商中,其中系数对于m-n奇数为Z,对于m-n偶数为Z2.

英文摘要:

We define an isotopy invariant of embeddings N -> R^m of manifolds into Euclidean space. This invariant together with the α-invariant of Haefliger-Wu is complete in the dimension range where the α-invariant could be incomplete. We also define parametric connected sum of certain embeddings (analogous to surgery). This allows to obtain new completeness results for the α-invariant and the following estimation of isotopy classes of embeddings. For the piecewise-linear category, a (3n-2m+2)-connected n-manifold N and (4n+4)/3 < m < (3n+3)/2 each preimage of α-invariant injects into a quotient of H_{3n-2m+3}(N), where the coefficients are Z for m-n odd and Z_2 for m-n even.

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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