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arXiv 2104.08897math.NT
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Minkowski问号函数迭代在特殊点的导数

Derivative of the iterations of Minkowski question mark function in special points

Nikita Shulga

摘要:

对于闵可夫斯基问号函数$?(x)$,我们考虑函数$f_n(x) = \underbrace{?(?(...?}_\text{n times}(x)))$的导数。除了明显的情况下(有理数为例),它是不平凡的,以找到明确的例子数$x$,其中$f'_n(x)=0$。本文给出了一个无理数集合,使得对于这个集合的每个元素$x_0$和任何$n\in\mathbb{Z}_+$,都有$f'_n(x_0)=0$ .

英文摘要:

For the Minkowski question mark function $?(x)$ we consider derivative of the function $f_n(x) = \underbrace{?(?(...?}_\text{n times}(x)))$. Apart from obvious cases (rational numbers for example) it is non-trivial to find explicit examples of numbers $x$ for which $f'_n(x)=0$. In this paper we present a set of irrational numbers, such that for every element $x_0$ of this set and for any $n\in\mathbb{Z}_+$ one has $f'_n(x_0)=0$.

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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