| 释义 |
- 正半定矩阵：一个n×n的实对称矩阵A是正半定的，当且仅当对于任意非零向量x∈R^n，都有x^T Ax≥0。
- 正半定函数：一个实函数f(x1,x2,……,xn)是正半定的，当且仅当对于任意实数a1,a2,……,an和任意正整数k，都有∑i,j=1 to n(ai aj ?^2f/?xi?xj)^k≥0。
- 正半定性：一个数学对象（如矩阵、函数等）是正半定的，当且仅当它满足正半定矩阵或正半定函数的定义。
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Then A is positive semidefinite, negative definite and negative semidefinite. - 2
A novel blind interference cancellation algorithm is proposed using positive semidefinite programming. - 3
The stiffness matrix corrected by the method not only satisfies the characteristic equation, but also is the unique symmetric positive semidefinite matrix. 用这个方法修正的刚度矩阵不仅满足特征方程，而且是唯一的对称半正定矩阵。
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