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arXiv 1509.04500math.NT
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复数的连分数展开式-一种通用方法

Continued fraction expansions for complex numbers - a general approach

S. G. Dani

摘要:

本文介绍了研究复数的连分数展开式的一般框架,并建立了相应的收敛序列的收敛性的一些结果。对于$\mathbb C$的离散子环中具有部分同元的连分数展开式,证明了经典Lagrange定理的一个类似定理,即二次根号是具有最终周期连分数展开式的数.对Eisenstein整数环上一类带部分幂元的连分数算法的收敛性证明了其收敛因子的绝对值的单调性和指数增长性。

英文摘要:

We introduce here a general framework for studying continued fraction expansions for complex numbers and establish some results on the convergence of the corresponding sequence of convergents. For continued fraction expansions with partial quotients in a discrete subring of $\mathbb C$ an analogue of the classical Lagrange theorem, characterising quadratic surds as numbers with eventually periodic continued fraction expansions, is proved. Monotonicity and exponential growth are established for the absolute values of the denominators of the convergents for a class of continued fraction algorithms with partial quotients in the ring of Eisenstein integers.

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