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arXiv 1206.3598math.NT
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关于一些小分圆整数的模

On the magnitudes of some small cyclotomic integers

Frederick Robinson, Michael Wurtz

摘要:

我们证明了R.M. Robinson于1965年提出的关于小分圆整数的定理。特别地,给定任意分圆整数$β$,其所有共轭的绝对值至多为5,证明了最大共轭的绝对值是由两个无限类和两个例外情形给出的四种显式类型之一.我们还扩展了这一结果表明,与一个形式的增加,猜想是真实的$β$的幅度高达5+1/25。

英文摘要:

We prove the last of five outstanding conjectures made by R.M. Robinson from 1965 concerning small cyclotomic integers. In particular, given any cyclotomic integer $β$ all of whose conjugates have absolute value at most 5, we prove that the largest such conjugate has absolute value one of four explicit types given by two infinite classes and two exceptional cases. We also extend this result by showing that with the addition of one form, the conjecture is true for $β$ with magnitudes up to 5+1/25.

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