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arXiv 1105.1986math.MG
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诣零空间的全等测地球格覆盖

On lattice coverings of Nil space by congruent geodesic balls

Jenő Szirmai

摘要:

Nil几何是8个三维Thurston几何之一,可以从{W. Heisenberg}著名的实矩阵群。本文研究了诣零空间中的{ \it格覆盖}。引入了覆盖密度的概念,给出了覆盖密度的上、下估计,并对最小稠格状测地球覆盖的球排列提出了一个猜想,给出了它的覆盖密度$Δ\approx 1.42900615$ .齐性3-空间在射影3-球面中有统一的解释,在我们的工作中,我们将使用Nil几何的射影模型。

英文摘要:

The Nil geometry, which is one of the eight 3-dimensional Thurston geometries, can be derived from {W. Heisenberg}'s famous real matrix group. The aim of this paper to study {\it lattice coverings} in Nil space. We introduce the notion of the density of considered coverings and give upper and lower estimations to it, moreover we formulate a conjecture for the ball arrangement of the least dense lattice-like geodesic ball covering and give its covering density $Δ\approx 1.42900615$. The homogeneous 3-spaces have a unified interpretation in the projective 3-sphere and in our work we will use this projective model of the Nil geometry.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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