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Quaternary quadratic forms with prime discriminant (2206.00412v1)

Published 1 Jun 2022 in math.NT

Abstract: Let $Q$ be a positive-definite quaternary quadratic form with prime discriminant. We give an explicit lower bound on the number of representations of a positive integer $n$ by $Q$. This problem is connected with deriving an upper bound on the Petersson norm $\langle C, C \rangle$ of the cuspidal part of the theta series of $Q$. We derive an upper bound on $\langle C, C \rangle$ that depends on the smallest positive integer not represented by the dual form $Q{*}$. In addition, we give a non-trivial upper bound on the sum of the integers $n$ excepted by $Q$.

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