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arXiv 2102.11897math.NT
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三角级数和贝塞尔级数的平衡导数、恒等式和界

Balanced Derivatives, Identities, and Bounds for Trigonometric and Bessel Series

Bruce C. Berndt, Martino Fassina, Sun Kim, Alexandru Zaharescu

摘要:

出于两个身份公布与拉马努金的丢失笔记本和连接,分别与高斯圆问题和狄利克雷除数问题,在较早的文件,三本作者得出陈述某些款项的产品三角函数作为二重级数的贝塞尔函数。本文通过引入平衡导数的新概念,推广了这些级数,得到了进一步的定理。正如我们将在下面看到的,不平衡情况下的收敛区域与平衡情况下的完全不同。从这个角度来看,值得注意的是,拉马努金有直觉,制定条目,在我们的新术语,“平衡”。如果$x$表示出现在我们的和中的三角函数的乘积的个数,除了证明上述恒等式外,还建立了和为$x\to\infty$的上、下界的定理和定理.

英文摘要:

Motivated by two identities published with Ramanujan's lost notebook and connected, respectively, with the Gauss circle problem and the Dirichlet divisor problem, in an earlier paper, three of the present authors derived representations for certain sums of products of trigonometric functions as double series of Bessel functions. These series are generalized in the present paper by introducing the novel notion of balanced derivatives, leading to further theorems. As we will see below, the regions of convergence in the unbalanced case are entirely different than those in the balanced case. From this viewpoint, it is remarkable that Ramanujan had the intuition to formulate entries that are, in our new terminology, "balanced". If $x$ denotes the number of products of the trigonometric functions appearing in our sums, in addition to proving the identities mentioned above, theorems and conjectures for upper and lower bounds for the sums as $x\to\infty$ are established.

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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