Some New Results of Positive Definite Matrices

It is important that a matrix is positive definited in many domain.In this paper,we introduce some rules and inequality relation about an n-square real symmetric positive definite matrix.Based on that we obtain that an n-square real positive definite matrix is symmetric.In particular,a to use method that an n-square real symmetric matrix is not positive definite is introduced.This method is very simple and convinient to use.