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arXiv 1609.03006math.AT
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平方运算与Singer代数变换

The squaring operartion and the Singer algebraic transfer

Nguyen Sum

摘要:

设$P_k$是阶化多项式代数$\mathbb F_2[x_1,x_2,\ldots ,x_k]$,每个$x_i$的阶为1,被看作模2 Steenrod代数$\mathcal A$上的模,$GL_k$是素域$\mathbb F_2$上的一般线性群,它规则地作用在$P_k$上.我们利用命中问题的技巧研究了Singer构造的代数转移。这种转移是从模-2 Steenrod代数的同调$\text{Tor}^{\mathcal A}_{k,k+n} (\mathbb F_2,\mathbb F_2)$到$\mathbb F_2{\otimes}_{\mathcal A}P_k$的子空间的同态,该子空间由度为$n$的所有$GL_k$ -不变类组成。本文推广了Hung关于Steenrod代数上同调的Singer代数转移与平方运算之间关系的一个结果。利用这一结果,我们证明了Singer关于代数转移的猜想在$k=5$和次数$5(2^{s} -1)$($s$为任意正整数)的情况下成立.

英文摘要:

Let $P_k$ be the graded polynomial algebra $\mathbb F_2[x_1,x_2,\ldots ,x_k]$, with the degree of each $x_i$ being 1, regarded as a module over the mod-2 Steenrod algebra $\mathcal A$, and let $GL_k$ be the general linear group over the prime field $\mathbb F_2$ which acts regularly on $P_k$. We study the algebraic transfer constructed by Singer using the technique of the hit problem. This transfer is a homomorphism from the homology of the mod-2 Steenrod algebra, $\text{Tor}^{\mathcal A}_{k,k+n} (\mathbb F_2,\mathbb F_2)$, to the subspace of $\mathbb F_2{\otimes}_{\mathcal A}P_k$ consisting of all the $GL_k$-invariant classes of degree $n$. In this paper, we extend a result of Hung on the relation between the Singer algebraic transfer and the squaring operation on the cohomology of the Steenrod algebra. Using this result, we show that Singer's conjecture for the algebraic transfer is true in the case $k=5$ and the degree $5(2^{s} -1)$ with $s$ an arbitrary positive integer.

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