Investigates congruence classes in quadratic forms, suggesting refined results in real quadratic fields.
We study the congruence classes attained by positive integers D with a prescribed period for the continued fraction of √ D . As an application, we refine the results on large ranks of universal quadratic forms over real quadratic fields by imposing congruence conditions on their discriminants.
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Menšíková et al. (2026) studied this question.
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