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u condition
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     lcer condition on L.
     lder条件,证明这个可数集条件是充要条件,并且得到了它的另外二个等价条件。
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     condition and implement the p.
     条件及 p.
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     Under the condition:(H) (?)
     (H) (?)
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     以期在当前户外广告迅速膨胀的态势下,为我国户外广告的良性发展提供更多的思考空间。
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  u condition
A smaller, but significant repetition effect emerged for the A/U condition.
      


In this Paper the main results are as follows. 1 let G be a l-group, and P_1, P_2,…,P_n the pairwise incomparable primesubgroups of G, then there are 0u) condition if and only if G∈O.(Theorem 9) 3 It G is an l-group, the following are equivalent: (1) G∈F_v and G is porojectable. (2) G∈F and G is projectable; (3) G∈O. (Corollary to lemma 10)

本文主要结果如下:1 设G是1-群,P_1,P_2,…,P_n是n个两两相互不可比较的素子群,则存在0

In this paper we prove following: Theeorem 1,Let R be a commutative semilocal ring,2∈R~*, S/M_()F_3,t=1,…,r.Then Subgroup G of U_2(R) is normal() there exists aideal A of R such that TG (R,A)()G()UC (R,A). Theorem 2.Let R be a commutative semil ocal ring,S/M_t() F_2,F_3,F_().Then automorphism of U_2(R) is following form: () where p∈GL_2(S),x is a homomorphism of U_2(R) into its center, h satifies U-condition.

文献[1]给出了域和特征非零的体上的 Witt 指数非零的二阶酉群的自同构形式,本文确定了交换半局部环上 Witt 指数非零的二阶酉群的正规子群与自同构形式。

In this paper, a new design method of amplitude modulation trellis codes (AM-TCM) is presented. Firstly the properties of the trellis diagram are studied, the procedure of arranging output signals satisfying U-condition and linearity to the signal constellation is described and the number of the unequiva-lent arrangements is formulated. Conditions of catastrophic codes are also discussed.Then a new algorithm of free Euclidean distance is developed In the end a breif account of the design procedure...

In this paper, a new design method of amplitude modulation trellis codes (AM-TCM) is presented. Firstly the properties of the trellis diagram are studied, the procedure of arranging output signals satisfying U-condition and linearity to the signal constellation is described and the number of the unequiva-lent arrangements is formulated. Conditions of catastrophic codes are also discussed.Then a new algorithm of free Euclidean distance is developed In the end a breif account of the design procedure of the best AM-TCM codes are given. Compared with Ungerboeck's design method, our method has many advantages.

本文提出了幅度调制的格状编码调制(AM-TCM)设计的一种新方法。本文首先研究了格状图的一些性质,指出了满足在U条件的线性不等阶信号安排的方法,给出了其个数的计算公式,讨论了恶性码条件。然后根据信号之间的约束关系,导出了自由欧氏距离的一种新算法,最后概述了最佳码的设计步骤。将本文方法与Ungerboeck方法进行比较,表明本文方法有不少优点。

 
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