Class numbers of positive definite quaternary quadratic forms.
Arnold K. Pizer (1976)
Journal für die reine und angewandte Mathematik
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Arnold K. Pizer (1976)
Journal für die reine und angewandte Mathematik
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Svetozar Kurepa (1987)
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Under the assumption that the ternary form x² + 2y² + 5z² + xz represents all odd positive integers, we prove that a ternary quadratic form ax² + by² + cz² (a,b,c ∈ ℕ) represents all positive integers n ≡ 4(mod 8) if and only if it represents the eight integers 4,12,20,28,52,60,140 and 308.
Izhboldin, Oleg T. (1998)
Documenta Mathematica
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Pete L. Clark, William C. Jagy (2014)
Acta Arithmetica
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We study ADC quadratic forms and Euclidean quadratic forms over the integers, obtaining complete classification results in the positive case.
A.I. Barvinok (1993)
Discrete & computational geometry
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Zhi-Hong Sun (2011)
Acta Arithmetica
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Mireille Car (2008)
Acta Arithmetica
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