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arXiv 2302.01611math.COmath.NT
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从整数到对称矩阵的单拟同态

One-quasihomomorphisms from the integers into symmetric matrices

Tim Seynnaeve, Nafie Tairi, Alejandro Vargas

摘要:

一个从$\mathbb{Z}$到特征$0$的任意域$K$上的对称矩阵的函数$f$是$1$ -拟同态,如果矩阵$f(x+y) - f(x) - f(y)$对所有$x,y \in \mathbb{Z}$秩至多为$1$.我们证明了任何这样的$1$ -拟同态与实际的群同态的距离至多为$2$.这给出了一个积极的回答一个特殊情况下的问题所提出的Kazhdan和齐格勒。

英文摘要:

A function $f$ from $\mathbb{Z}$ to the symmetric matrices over an arbitrary field $K$ of characteristic $0$ is a $1$-quasihomomorphism if the matrix $f(x+y) - f(x) - f(y)$ has rank at most $1$ for all $x,y \in \mathbb{Z}$. We show that any such $1$-quasihomomorphism has distance at most $2$ from an actual group homomorphism. This gives a positive answer to a special case of a problem posed by Kazhdan and Ziegler.

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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