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arXiv 0807.0540math.NTmath.CO
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关于指数生成级数的指数

On exponentials of exponential generating series

Roland Bacher

摘要:

将指数生成级数的代数与形式幂级数的shuffle代数等同起来,可以为任意域$\mathbb K$上常系数为1的指数生成级数所形成的相应李群定义一个指数映射${\mathop{exp}}_!:X\mathbb K[[X]]\longrightarrow 1+X\mathbb K[[X]]$.本文的主要结果表明,如果域$\mathbb K$是特征$p$的代数闭域$\bar{\mathbb F}_p$的一个子域,则映射${\mathop{exp}}_!$(及其逆映射${\mathop{log}}_!$)诱导$X\mathbb K [[X]]$和$1+X\mathbb K[[X]]$中的有理代数级数之间的双射.

英文摘要:

Identifying the algebra of exponential generating series with the shuffle algebra of formal power series, one can define an exponential map ${\mathop{exp}}_!:X\mathbb K[[X]]\longrightarrow 1+X\mathbb K[[X]]$ for the associated Lie group formed by exponential generating series with constant coefficient 1 over an arbitrary field $\mathbb K$. The main result of this paper states that the map ${\mathop{exp}}_!$ (and its inverse map ${\mathop{log}}_!$) induces a bijection between rational, respectively algebraic, series in $X\mathbb K [[X]]$ and $1+X\mathbb K[[X]]$ if the field $\mathbb K$ is a subfield of the algebraically closed field $\bar{\mathbb F}_p$ of characteristic $p$.

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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