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Exponents of class groups of certain imaginary quadratic fields

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arxiv 1801.00392 v2 pith:HKYAQVWU submitted 2018-01-01 math.NT

Exponents of class groups of certain imaginary quadratic fields

classification math.NT
keywords classfieldsgroupsidealimaginaryquadraticcertaincite
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Let $n>1$ be an odd integer. We prove that there are infinitely many imaginary quadratic fields of the form $\mathbb{Q}(\sqrt{x^2-2y^n})$ whose ideal class group has an element of order $n$. This family gives a counter example to a conjecture by H. Wada \cite{WA70} on the structure of ideal class groups.

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  1. Branched covers of $\mathbb{P}^1$ and divisibility in class group

    math.NT 2026-04 unverdicted novelty 5.0

    n-torsion in the Jacobian of an m-gonal curve yields n-torsion in the class group of an associated number field K via branched covers of the projective line.