\`x^2+y_1+z_12^34\`
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Cesaro summation by spheres of lattice sums and Madelung constants

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The first author is supported by the LMS URB grant 1920-04. The second author is supported by the EPSRC grant EP/P024920/1

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  • We study convergence of 3D lattice sums via expanding spheres. It is well-known that, in contrast to summation via expanding cubes, the expanding spheres method may lead to formally divergent series (this will be so e.g. for the classical NaCl-Madelung constant). In the present paper we prove that these series remain convergent in Cesaro sense. For the case of second order Cesaro summation, we present an elementary proof of convergence and the proof for first order Cesaro summation is more involved and is based on the Riemann localization for multi-dimensional Fourier series.

    Mathematics Subject Classification: Primary: 11L03, 42B08; Secondary: 35B10, 35R11.

    Citation:

    \begin{equation} \\ \end{equation}
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  • Figure 1.  A figure plotting $ N $th partial sums of (3.4) with $ a = 0 $ and $ s = \frac12 $ up to N = 5000

    Figure 2.  A figure plotting $ N $th partial sums of (3.15) with $ a = 0 $ and $ s = \frac12 $ up to N = 5000

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