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arXiv 1003.3716math.NTmath.RT
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等差数列中不定二元二次型类数和的渐近公式

Asymptotic formulas for class number sums of indefinite binary quadratic forms in arithmetic progressions

Yasufumi Hashimoto

摘要:

已知本原不定二元二次型的等价类与模群的本原双曲共轭类之间存在一一对应。由于这种对应,Sarnak利用模群的素测地线定理得到了基本单位阶的类数和的渐近公式。本文给出了等差数列中判别式上类数和的渐近公式。由于判别式的算术性质与由模群及其同余子群给出的有限群中的共轭类之间存在联系,通过整理Tchebotarev型质测地线定理,可以得到所需的渐近公式.虽然Raulf已经给出了这样的渐近公式,但方法是完全不同的,我们的渐近公式的首项的表达式更简单,其余项的估计更尖锐。

英文摘要:

It is known that there is a one-to-one correspondence between equivalence classes of primitive indefinite binary quadratic forms and primitive hyperbolic conjugacy classes of the modular group. Due to such a correspondence, Sarnak obtained the asymptotic formula for the class number sum in order of the fundamental unit by using the prime geodesic theorem for the modular group. In the present paper, we propose asymptotic formulas of the class number sums over discriminants in arithmetic progressions. Since there are relations between the arithmetic properties of the discriminants and the conjugacy classes in the finite groups given by the modular group and its congruence subgroups, we can get the desired asymptotic formulas by arranging the Tchebotarev-type prime geodesic theorem. While such asymptotic formulas were already given by Raulf, the approaches are quite different, the expressions of the leading terms of our asymptotic formulas are simpler and the estimates of the reminder terms are sharper.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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