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研究生: 林佳葦
論文名稱: 二次體中的 class number 與 Dirichlet 的 L 級數
Class Numbers of Quadratic Fields and Dirichlet L-series
指導教授: 紀文鎮
學位類別: 碩士
Master
系所名稱: 數學系
Department of Mathematics
論文出版年: 2011
畢業學年度: 99
語文別: 中文
論文頁數: 36
中文關鍵詞: Class Number二次體Dirichlet L 級數
英文關鍵詞: Class Number, Quadratic Field, Dirichlet L-series
論文種類: 學術論文
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  • 在本論文中,我們完整的證明了Dirichlet’s theorem。另外,我們針對在Quadratic fields中的L-series作研究,寫成許多不同的形式。利用L-series在s=1時的不同形式可推導出class number的一些公式。由class number最後推導出的公式可看出quadratic residues和quadratic nonresidues的個數在區間 (0,p/2) 的分布情形。最後,我們給了一些在quadratic fields中,L-series在s=1時,用不同的character代入所得到的特殊值。

    In this thesis, we first review some well-known results about the Dirichlet characters and L-series. Then we give an elaborate proof of Dirichlet's theorem. Besides, we are interesting in the formulas of L-series associated to the quadratic fields. Then we compute class numbers of quadratic fields with L-series at $s=1$ and the Gaussian sum. In the end, examples of L-series at $s=1$ are given.

    1. Dirichlet Characters and L-series 2 1.1. Dirichlet characters 2 1.2. L-series 5 2. Dirichlet’s Theorem 7 2.1. Define ln L(s, χ) 7 2.2. The Key Step 8 2.3. A Proof of Dirichlet’s Theorem 12 3. Quadratic Dirichlet L-series 13 3.1. Summation Formulas of the Series L(1, χ) Associated to Quadratic Dirichlet Characters 13 3.2. The Character Associated to a Quadratic Field 18 3.3. Some Formulas for the Class Numbers of Quadratic Fields 28 3.4. Some Examples 34 References 35

    [1]Kenneth\ F.\ Ireland, Michael\ I.\ Rosen, A Classical Introduction to Modern Number Theory, Springer.
    [2]Lawrence\ C.\ Washington, Introduction to Cyclotomic Fields, Springer, New York, c1982.
    [3]Z.\ I.\ Borevich, I.\ R.\ Shafarevich, Number Theory, Academic Press, New York, 1966.
    [4]}Wladyslaw\ Narkiewicz, Elementary and Analytic Theory of Algebraic Numbers, Springer-Verlag, Berlin and New York , PWN-Polish Scientific Publishers , Warszawa , c1990.[5]Steven\ R.\ Finch, Quadratic Dirichlet L-Series, unpublished note, 2005, pp.1--2.
    [6]James\ K.\ Strayer, Elemetary Number Theory, PWS Pub. Co., Boston, c1994.

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