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The Voronoi Identity via the Laplace Transform

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Abstract

The classical Voronoi identity

$$\Delta (x) = - \frac{2}{\pi }\sum\limits_{n = 1}^\infty {d(n)} \left( {\frac{x}{n}} \right)^{1/2} \left( {K_1 (4\pi \sqrt {xn} ) + \frac{\pi }{2}Y_1 (4\pi \sqrt {xn} )} \right)$$

is proved in a relatively simple way by the use of the Laplace transform. Here Δ(x) denotes the error term in the Dirichlet divisor problem, d(n) is the number of divisors of n and K_1, Y_1 are the Bessel functions. The method of proof may be used to yield other identities similar to Voronoi's.

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Ivić, A. The Voronoi Identity via the Laplace Transform. The Ramanujan Journal 2, 39–45 (1998). https://doi.org/10.1023/A:1009753723245

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