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CUSP FORMS IN S4 (r0 (79)) AND THE NUMBER OF REPRESENTATIONS OF POSITIVE INTEGERS BY SOME DIRECT SUM OF BINARY QUADRATIC FORMS WITH DISCRIMINANT -79

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초록

A basis of a subspace of $S_{4}\left( \Gamma _{0}\left( 79\right) \right) $ is given and the formulas for the number of representations of positive integers by some direct sums of the quadratic forms $x_{1}^{2}+x_{1}x_{2}+20x_{2}^{2},$ $ 4x_{1}^{2}\pm x_{1}x_{2}+5x_{2}^{2},$ $2x_{1}^{2}\pm x_{1}x_{2}+10x_{2}^{2}$ are determined.

Abstract

A basis of a subspace of $S_{4}\left( \Gamma _{0}\left( 79\right) \right) $ is given and the formulas for the number of representations of positive integers by some direct sums of the quadratic forms $x_{1}^{2}+x_{1}x_{2}+20x_{2}^{2},$ $ 4x_{1}^{2}\pm x_{1}x_{2}+5x_{2}^{2},$ $2x_{1}^{2}\pm x_{1}x_{2}+10x_{2}^{2}$ are determined.

참고문헌 (3)

  1. H. Ivaniec, "Analytic Number Theory", American Mathematical Society Colloquium publications, 53 (2000)
  2. G. Lomadze, "On the number of representations of positive integers by a direct sum of binary quadratic forms with discriminant -23", Georgian Math. J, 4(6), pp.523~532 (1997)
  3. T. Miyake, "Modular Forms" (1989), Springer-Verlag

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