On the spectrum of the Zhang-Zagier height
On the spectrum of the Zhang-Zagier height
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张扎吉尔高度谱
DOI:
10.1090/s0025-5718-00-01183-2
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发表时间:
2001
期刊:
影响因子:
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通讯作者:
C. Doche
中科院分区:
文献类型:
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作者:
C. Doche
From recent work of Zhang and of Zagier, we know that their height n(α) is bounded away from 1 for every algebraic number a different from 0,1,1/2± √-3/2. The study of the related spectrum is especially interesting, for it is linked to Lehmer's problem and to a conjecture of Bogomolov. After recalling some definitions, we show an improvement of the so-called Zhang-Zagier inequality. To achieve this, we need some algebraic numbers of small height. So, in the third section, we describe an algorithm able to find them, and we give an algebraic number with height 1.2875274Z… discovered in this way. This search up to degree 64 suggests that the spectrum of n(α) may have a limit point less than 1.292. We prove this fact in the fourth part.