On the Indecomposable Modules of Uq（sl（2）） Constructed via Ore-extension

Let A be a subalgebra of Uq (sl(2)) generated by K, K-1 and F and Aδ be a subalgebra of Uq (sl(2)) generated by K, K-1 (and also Fd if q is a primitive d-th root of unity with d an odd number). Given an Aδ -module M, a Uq (sl(2))-module AAδ M is constructed via the iterated Ore extension of Uq (sl(2)) in a unified framework for any q. Then all the submodules of AAδ M are determined for a fixed finite-dimensional indecomposable Aδ -module M . It turns out that for some indecomposable Aδ -module M , the Uq (sl(2))-module AAδ M is indecomposable, which is not in the BGG-categories Oq associated with quantum groups in general.     

量子群u_q(sl(2))中理想的唯一分解

本文利用量子群uq(sl(2))的表示及其理想的生成子,证明了uq(sl(2))的任一非零理想在某种意义下可唯一分解为若干个素理想的乘积.由此得到理想的求根公式.     

量子群Uq(sl(2))中理想的唯一分解

本文利用量子群Uq(sl(2))的表示及其理想的生成子,证明了Uq(sl(2))的任一非零理想在某种意义下可唯一分解为若干个素理想的乘积.由此得到理想的求根公式.     

量子群Uq（sl（2））的非负部分

设U≥0是量子群Uq(sl(2))的非负部分,在本中,我们确定了U≥0的中心Z（U≥0）和U≥0有不可约表示。     

量子群V_q(sl(2))的商代数

本文研究当q是单位根时,V_q(sl(2))在关系H~r=K~r=1,E~(mr)=F~(nr)=0下的商代数V_q(m,n)的构造与分解,以及它的区块结构.为此,首先将U_q(sl(2))的基本性质和重要结论推广到V_q(sl(2)),并研究V_q(sl(2))的模的基本性质.利用这些结论,我们逐步构造出V_q(m,n)的左理想,并将V_q(m,n)分解成不可分解的左理想的直和.然后,把V_q(m,n)的不可分解的左理想合并成区块,并研究区块结构,从而把V_q(m,n)的表示问题归结成一个代数表示论的问题.     

半单李代数的单纯作用

本文证明了任何半单李代数(或者李群)在连通光滑流形上的非平凡单纯作用一定没有驻点.而且有效作用的那部分必定是同构于sl(2,R)(或者SL(2,R))的理想.     

BLOW-UP AND GLOBAL EXISTENCE FOR A COUPLED SYSTEM OF DEGENERATE PARABOLIC EQUATIONS IN A BOUNDED DOMAIN

This article deals with the conditions that ensure the blow-up phenomenon or its absence for solutions of the system ut=△ul up1vq1 and vt=△vm up2vq2 with homogeneous Dirichlet boundary conditions. The results depend crucially on the sign of the difference p2q1-(l-P1)(m-q2), the initial data, and the domainΩ.     

关于李代数的模扩张

设g是复数域C上的有限维半单纯李代数,?是Bernstein-Gelfand-Gelfand(BGG)范畴。J.Humphreys给出了Ext_?~1在Verma模上的成零条件。本文讨论了一些Ext_?~n的一般性质和在g-模范畴上的 Ext_(?(g))~n 在Verma模上的成零条件并用于计算当 g=sl(2,C)时所有的Ext_?~n(V,V_1)和Ext_(?(g))~n,其中n∈Z_+(非负整数集合),V和V_1同时为Verma模(或不可约最高权模)。结果证明当 g=sl(2,C)时,Ext_?~n(V,V_1)的维数至多是 1,而 Ext_(?(g)~n(V,V_1)的维数至多为2。     

On the elliptic curve y 2 = x 3 −2rDx and factoring integers

Let D=pq be the product of two distinct odd primes.Assuming the parity conjecture,we construct infinitely many r≥1 such that E2rD:y2=x3-2rDx has conjectural rank one and vp(x([k]Q))≠vq(x([k]Q))for any odd integer k,where Q is the generator of the free part of E(Q).Furthermore,under the generalized Riemann hypothesis,the minimal value of r is less than c log4 D for some absolute constant c.As a corollary,one can factor D by computing the generator Q.     

On the functional equation f(x+g(y))-f(y+g(y))=f(x)-f(y) on groups

We solve the equation

The matrix equationa(x∘y)=a(x)+a(x)a(y)+a(y)

Aequationes mathematicae -     

On the system of functional equationsf(x + y) = f(x) + f(y) andf(xy) = p (x)f(y) + q(y)f(x)

Aequationes mathematicae -