dual operations

By discussing the content of dual operations , dual figures and dual principle , the article puts forward the concept of dual method , and expound further the use of dual principle and dual method in the higher geometry and wide use in other subjects

本文通过论述对偶运算、对偶图形、对偶原理等内容，提出了对偶方法的概念，并阐明对偶原理及其方法在高等几何中的作用与其他学科中的广泛应用

From the Chinese market-oriented economic and financial system evolution of the regional economic development level , the performance in the financial sector for the regional characteristics of the dual structure of financial operations .

源于中国市场化取向的经济与金融制度变迁过程的区域经济发展水平差异，在金融领域表现为区域金融运行的二元结构特征。

Addition , cartesian production , union operations of dual Petri net and some properties are given . The conditions for preserving structural properties after dual net operations are discussed .

给出了对偶Petri网的加法，笛卡尔积，并运算及有关性质，得到了对偶Petri网运算具有结构性质的条件Net混合编程的技巧。NET和ADO。