正定矩阵 Positive-definite matrix
（重定向自Symmetric positive definite）
在线性代数里，正定矩阵是埃尔米特矩阵的一种，有时会简称为正定阵。在双线性代数中，正定矩阵的性质类似复数中的正实数。与正定矩阵相对应的线性算子是对称正定双线性形式（复域中则对应埃尔米特正定双线性形式）。
Symmetric positive definite
中文百科
英语百科
Positive-definite matrix 正定矩阵
（重定向自Symmetric positive definite）
In linear algebra, a symmetric n × n real matrix 
is said to be positive definite if the scalar 
is positive for every non-zero column vector 
of 
real numbers. Here 
denotes the transpose of .
More generally, an n × n Hermitian matrix is said to be positive definite if the scalar 
is real and positive for all non-zero column vectors of complex numbers. Here 
denotes the conjugate transpose of .
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