Private if good Abstract:linear equations and square and such forms of expression more generally known as the second type,often second-linear algebra in engineering and signal processing applications,they often appear in physics Xue,differential geometry,in Economics and Statistics.
This paper introduces the concept of the secondary and its standard form,on the basis of this leads to the second type is closely related to two concepts:Contract matrix and the second-positive,and described in detail and then revealed the second Type theory in practice applications.
In order to better described the second type of theory and its applications,the paper is divided into four parts:the first part of the second on the concept and its standard form.In the second part and third part,elaborated on the contract matrix and the second-positive.The fourth part is the second type of application.In this section,the adoption of the theory in this survey of population and the optimization of an example to illustrate.
Keyword:quadratic,the standard form,standardized form,Zhengding