Einige Eigenschaften der Poincaréschen Reihen der Dimension-2

We present a new short and simple proof of the classical theorem that the Poincaré series of dimension-2 for a finitely generated Fuchsian group of the first kind diverges. Our proof is only based on the finiteness of the invariant measure of a fundamental domain of such a group and does not use any detailed information about the geometrical structure of special suitably chosen fundamental domains. The starting point of our argument is a slight generalization of a theorem stated by K. V. RAJESWARA RAO [7] saying that a certain Poincaré series for a Fuchsian group, if it does converge, is a bounded function on the unit disk.     

GL(n,K)中一类准可解子群的结构及其在Fuchsian系统中的应用(英文)

本文研究了单值群的可解性与Fuchsian方程可积性之间的关系.利用可解群及GL(n,K)的性质,获得GL(n,K)中一类准可解子群的结构定理,并将之心用于Fuchsian系统的可积性研究之中.     

Constructing an automorphic form from the orbit of a transformation

We consider the Fuchsian groups of linear-fractional transformations. We propose a new method for presenting automorphic forms as gap series over an appropriate subset of transformations of the group which is not a subgroup. Comparative analysis of the Poincaré theta-series and gap series demonstrates that the use of gap series requires less transformations and parameters that the summands of series depend on.     

关于特征和的混合均值

研究了特征和及其算术性质,并利用解析方法得到了两个关于特征和的混合均值的渐近公式,从而推广了特征和的算术性质。     

Fuchsian convex bodies: basics of Brunn–Minkowski theory

The hyperbolic space ${\mathbb{H}^d}$ can be defined as a pseudo-sphere in the (d + 1) Minkowski space-time. In this paper, a Fuchsian group Γ is a group of linear isometries of the Minkowski space such that ${\mathbb{H}^d/\Gamma}$ is a compact manifold. We introduce Fuchsian convex bodies, which are closed convex sets in Minkowski space, globally invariant for the action of a Fuchsian group. A volume can be associated to each Fuchsian convex body, and, if the group is fixed, Minkowski addition behaves well. Then Fuchsian convex bodies can be studied in the same manner as convex bodies of Euclidean space in the classical Brunn–Minkowski theory. For example, support functions can be defined, as functions on a compact hyperbolic manifold instead of the sphere. The main result is the convexity of the associated volume (it is log concave in the classical setting). This implies analogs of Alexandrov–Fenchel and Brunn–Minkowski inequalities. Here the inequalities are reversed.     

拟Fuchs群的收敛指数

根据H2上的双曲距离在拟共形变换下的拟不变性,给出了K-拟共形抛物循环Fuchs群的收敛指数的估计．     

SL(n,C)上一类特殊可解子群的结构及其在Fuchs系统中的应用

给出了SL(n,C)中一类特殊的具有有限个生成元的可解子群的结构定理.由单值群的可解性与Fuchs系统的可积性之间的关系,研究对应的单值群是可解的环面上只有一个正则起点的n阶Fuchs方程的解Riemann曲面结构,进而研究其解的大范围性质.     

关于广义$k$次高斯和的均值

The main purpose of this paper is using residue system and character sums methods to investigate the mean value properties of general k-th Gauss sums,and two exact calculating formulas are given.     

On the additive energy of the distance set in finite fields

We use character sums to derive new bounds on the additive energy of the set of distances (counted with multiplicities) between two subsets of a vector space over a given finite field. We also give applications to sumsets of distance sets.     

SL(2κ,C)中两类特殊可解子群的结构及其在Fuchs系统中的应用

利用SL（2,C）中可解子群的结构,给出了SL（2k,C）中两类特殊的具有两个生成元的可解子群的结构定理．由单值群的可解性与Fuchs系统可积性之间的关系,研究对应的单值群是可解的环面上只有一个正则奇点的2k阶Fuchs方程的解Riemann曲面结构,进而研究其解的大范围性质．     

SL(2κ,C)中两类特殊可解子群的结构及其在Fuchs系统中的应用

利用SL(2,C)中可解子群的结构,给出了SL(2k,C)中两类特殊的具有两个生成元的可解子群的结构定理.由单值群的可解性与Fuchs系统可积性之间的关系,研究对应的单值群是可解的环面上只有一个正则奇点的2k阶Fuchs方程的解Riemann曲面结构,进而研究其解的大范围性质.     

Representation of automorphic forms as lacunary series and Blaschke products

In this paper we consider Fuchsian groups of convergent type. We construct automorphic forms of various weights as lacunary series with respect to a set of transformations of a group that does not have the structure of a subgroup. We also construct an automorphic form of zero weight that is the Blaschke product.     

On pseudo-random subsets of $${\mathbb Z _n}$$

The notion of pseudo-randomness of subsets of \({\mathbb Z_n}\) is defined, and the measures of pseudo-randomness are introduced. Then a construction (based on the use of hybrid character sums) will be presented for subsets of \({\mathbb Z_p}\) with strong pseudo-random properties.     

SL(n,C)中的一些特殊可解子群及应用

给出了SL(n,C)中的几类特殊可解子群,并应用于Fuchs系统.由Fuchs方程的单值群的可解性与其可积性的关系,给出了其可积的一些条件.     

On geometric density of Hecke eigenvalues for certain cusp forms

In this paper we prove certain density results for Hecke eigenvalues as well as we give estimates on the length of modules for Hecke algebra acting on the cusp forms constructed out of Poincaré series for a semisimple group G over a number field k. The cusp forms discusses here are taken from Muić (Math Ann 343:207–227, 2009) and they generalize usual cuspidal modular forms S _k (Γ) of weight k ≥ 3 for a Fuchsian group Γ (Muić, in On the cuspidal modular forms for the Fuchsian groups of the first kind).     

关于Poincar级数算子的范数的一个注记

设无挠Ｆｕｃｈｓ群Ｔ及其子群Г’对应的Ｐｏｉｎｃａｒ级数算子为，对于Г的Ｔｅｉｃｈｍｌｌｅｒ空间Ｔ（Г）中的任意一点［ｆ］，有相应的算子，其中Гｆ＝ｆГｆ－１，从而的范数，为Ｔ（Г）上的函数．众所周知．本文证明了在整个没有小于１的上界     

指数和与特征和的混合均值

本文利用三角和估计及其特征和的性质研究一类二项指数和与多项式特征和的混合均值的计算问题,并给出两个有趣的计算公式.     

Character theory of symmetric groups, subgroup growth of Fuchsian groups, and random walks

We develop a number of statistical aspects of symmetric groups (mostly dealing with the distribution of cycles in various subsets of Sn), asymptotic properties of (ordinary) characters of symmetric groups, and estimates for the multiplicities of root number functions of these groups. As main applications, we present an estimate for the subgroup growth of an arbitrary Fuchsian group, a finiteness result for the number of Fuchsian presentations of such a group (resolving a long-standing problem of Roger Lyndon), as well as a proof of a well-known conjecture of Roichman concerning the mixing time of random walks on symmetric groups.     

Teichmuller空间的星形结构问题

对于任一保持单位圆盘Δ及其外部Δ的Ｆｕｃｈｓ群Γ，利用Ｂｅｒｓ嵌入，Ｔｅｉｃｈｍｕｌｌｅｒ空间Ｔ（Γ）可看成是Δ上Γ的有界全纯二次微分Ｂ（Δ，Γ）中的一个有界区域，本文的目的是讨论Ｔｅｉｃｈｍｕｌｌｅｒ空间Ｔ（Γ）的星形问题。特别地，我们证明了：当Γ是第二类Ｆｕｃｈｓ群时，Ｔ（Γ）不是星形的．