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On the Iwasawa $\lambda$-invariant of the cyclotomic $\mathbb {Z}_2$-extension of $\mathbb {Q}(\sqrt {p} )$


Authors: Takashi Fukuda and Keiichi Komatsu
Journal: Math. Comp. 78 (2009), 1797-1808
MSC (2000): Primary 11G15, 11R27, 11Y40
DOI: https://doi.org/10.1090/S0025-5718-09-02124-3
Published electronically: January 28, 2009
MathSciNet review: 2501076
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Abstract: We study the Iwasawa $\lambda$-invariant of the cyclotomic $\mathbb {Z}_2$-extension of $\mathbb {Q}(\sqrt {p} )$ for an odd prime number $p$ which satisfies $p\equiv 1\pmod {16}$ relating it to units having certain properties. We give an upper bound of $\lambda$ and show $\lambda =0$ in certain cases. We also give new numerical examples of $\lambda =0$.


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Additional Information

Takashi Fukuda
Affiliation: Department of Mathematics, College of Industrial Technology, Nihon University, 2-11-1 Shin-ei, Narashino, Chiba, Japan
Email: fukuda@math.cit.nihon-u.ac.jp

Keiichi Komatsu
Affiliation: Department of Mathematical Science, School of Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo 169-8555, Japan
Email: kkomatsu@waseda.jp

Keywords: Iwasawa invariants, real quadratic fields
Received by editor(s): May 30, 2007
Received by editor(s) in revised form: November 16, 2007
Published electronically: January 28, 2009
Dedicated: In memory of Professor H. Ogawa
Article copyright: © Copyright 2009 American Mathematical Society
The copyright for this article reverts to public domain 28 years after publication.