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Proceedings of the American Mathematical Society

Published by the American Mathematical Society since 1950, Proceedings of the American Mathematical Society is devoted to shorter research articles in all areas of pure and applied mathematics.

ISSN 1088-6826 (online) ISSN 0002-9939 (print)

The 2020 MCQ for Proceedings of the American Mathematical Society is 0.85.

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Sums of three integer squares in complex quadratic fields
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by Dennis R. Estes and J. S. Hsia PDF
Proc. Amer. Math. Soc. 89 (1983), 211-214 Request permission

Abstract:

We classify all complex quadratic number fields that have all their algebraic integers expressible as a sum of three integer squares. These fields are $F = {\mathbf {Q}}(\sqrt { - D} )$, $D$ a positive square-free integer congruent to $3(\mod 8)$ and such that $D$ does not admit a positive proper factorization $D \equiv {d_1}{d_2}$ that satisfies simultaneously: ${d_1} \equiv 5,7(\mod 8)$ and $({d_2}/{d_1}) = 1$.
References
  • Dennis R. Estes and J. S. Hsia, Exceptional integers of some ternary quadratic forms, Adv. in Math. 45 (1982), no. 3, 310–318. MR 673805, DOI 10.1016/S0001-8708(82)80007-8
  • H. Hasse, Darstellbarkeit von Zahlen durch quadratische Formen in einem beliebigen algebraischen Zahlkorper, J. Reine Angew. Math. 153 (1924), 113-130.
  • J. S. Hsia, Representations by integral quadratic forms over algebraic number fields, Conference on Quadratic Forms—1976 (Proc. Conf., Queen’s Univ., Kingston, Ont., 1976) Queen’s Papers in Pure and Appl. Math., No. 46, Queen’s Univ., Kingston, Ont., 1977, pp. 528–537. MR 0498377
  • J. S. Hsia, On the classification of unimodular quadratic forms, J. Number Theory 12 (1980), no. 3, 327–333. MR 586460, DOI 10.1016/0022-314X(80)90024-4
  • O. T. O’Meara, Introduction to quadratic forms, Grundlehren der Math. Wiss., Springer-Verlag, New York, 1963.
  • Philippe Revoy, Sur les sommes de carrĂ©s dans un anneau, Ann. Sci. Univ. Besançon Math. (3) 11 (1979), 3–8 (French, with English summary). MR 651967
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Additional Information
  • © Copyright 1983 American Mathematical Society
  • Journal: Proc. Amer. Math. Soc. 89 (1983), 211-214
  • MSC: Primary 11E12; Secondary 11R11
  • DOI: https://doi.org/10.1090/S0002-9939-1983-0712624-2
  • MathSciNet review: 712624