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Nonnegative sums of roots of unity

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References

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Author notes

  1. Hans Günther Kopetzky

    Present address: Depart. of Mathematics, Technical University, A-8700, Leoben

  2. Wolfgang Schwarz

    Present address: Depart. of Mathematics, University of Frankfurt, Robert-Mayer-Straße 10, D-6000, Frankfurt a.M

  3. Eduard Wirsing

    Present address: Depart. of Mathematics, University of Ulm, Oberer Eselsberg, D-7900, Ulm/Donau

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    1. Hans Günther Kopetzky
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    2. Wolfgang Schwarz
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    3. Eduard Wirsing
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    Kopetzky, H.G., Schwarz, W. & Wirsing, E. Nonnegative sums of roots of unity. Arch. Math 34, 114–121 (1980). https://doi.org/10.1007/BF01224940

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