上代数 meaning in English
coalgebra
Examples
- This course covers the fundamental notions and results about algebraic varieties over an algebraically closed field . it also analyzes the relations between complex algebraic varieties and complex analytic varieties
本课程包括了代数闭域上代数簇的基本概念和结果，同时也讨论了复代数簇和复解析簇之间的关系。 - Second , after introduction of infinite relations on paraconsistent database , new method of extension of tuple has been developed based on particularity of algebraic operators in paraconsistent relations
其次,本文深入研究了次协调数据库中的无限关系,并根据次协调关系上代数运算的特性,提出了一种解决无限关系的有效方法。 - We find a simple relation between the maximal ergodic subgroup and distal properties of algebraic actions and characterize the distal properties of zd algebraic actions . we also prove that if the group action is equicontinuous then ergodicity and topological transitivity are equivalent
讨论了离散群在紧群上代数作用的极大遍历子群与distal性质的关系；给出了z ~ d代数作用的distal性质的刻画；证明了离散群等度连续作用下，遍历与拓扑可迁等价。 - Second , combining with the construction principle of geometry - goppa codes , we present a kind of new algebraic - geometry code by using the properties of algebraic curves on finite fields . we determine the value of the code - length n and d imension k , and the lower bound of the minimal distances of the new algebraic - geometry code . the new algebraic - geometry code have the following characteristics : ( l ) the new code is the generalization of geometry - goppa codes and the algebraic - geometry code constructed by chaoping xing and san ling in 2000 ( 2 ) compared with brouwer ' table of the best known codes , we find more new codes , there are at least 60 new codes under two - dimension cases
其次，结合几何goppa码的构造原理，利用有限域上代数曲线的特点来构造代数几何码，确定了新的代数几何码的码长n和维数k的取值，给出了最小距离d的下限，这类码的特点是： ( 1 )新的代数几何码是几何goppa码和新加坡国立大学chaopingxing和sanling在2000年所构造的代数几何码的推广； ( 2 )这类码中有许多种码的参数优于brouwer码表，仅二维情形时，就有60多种码优于brouwer码表。