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arXiv 2603.20876math.NTmath.CO
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整数复杂度的上界和下界估计

Upper and lower estimates for integer complexity

Steklov Mathematical Institute(斯捷克洛夫数学研究所)

Sergei Konyagin, Kristina Oganesyan

AI总结:

本文研究整数复杂度的上界和下界,证明了复杂度函数的对数行为,并给出了新的非平凡下界和渐进行为。

摘要:

本文研究整数复杂度的上界和下界,证明了复杂度函数的对数行为,并给出了新的非平凡下界和渐进行为。

英文摘要:

Let $\|n\|$ stand for the integer complexity of the number $n$, i.e. for the least number of $1$'s needed to write $n$ using arbitrary many additions, multiplications, and parentheses. The two-sided inequality $3\log_3 n\leq\|n\|\leq 3\log_2 n$ for all $n$ is well known and reveals the logarithmic behaviour of the complexity function $\|n\|$. While the lower bound $3\log_3 n$ is attained infinitely many times at powers of $3$, the best upper estimate is still unknown, although there are some improvements of the trivial bound $3\log_2 n$. Besides, for $``$typical$"$ numbers, i.e. for almost all numbers $n$, the better inequality $\|n\|\leq C_{avg}\log n$ holds, where, importantly, $C_{avg}\approx 3.236<\sup_{n} \frac{\|n\|}{\log n}$. We show that in fact $\|n\|\leq C_{avg}\log n+o(\log n)$ as $n\to\infty$, which, in particular, yields that $\limsup\limits_{n\to\infty}\frac{\|n\|}{\log n}\leq C_{avg}$. We also obtain the first nontrivial lower bound $\|n\|\geq 3.06\log_3 n$ for almost all numbers $n$.

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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