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arXiv math/0607084math.NT
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关于连分数上Lagrange定理的多维推广

On multidimensional generalization of the Lagrange theorem on continued fractions

Oleg N. German, Evgeniy L. Lakshtanov

摘要:

关于连分数的拉格朗日定理指出,一个数是二次根式当且仅当它的连分数展开最终是周期性的。目前的文件是致力于这一事实的多维概括。作为连分数的一种多维模拟,我们考虑了所谓的Klein多面体:给定n维欧几里得空间中的无理格,它的Klein多面体定义为具有非负坐标的非零格点的凸包.

英文摘要:

The Lagrange theorem on continued fractions states that a number is a quadratic surd if and only if its continued fraction expansion is eventually periodic. The current paper is devoted to a multidimensional generalization of this fact. As a multidimensional analog of continued fractions so called Klein polyhedra are considered: given an irrational lattice in an n-dimensional Euclidean space, its Klein polyhedron is defined as the convex hull of nonzero lattice points with nonnegative coordinates.

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