What Does PD Stand For?

PD stands for Positive Definite

Positive Definite (PD) refers to a property of a matrix in linear algebra that indicates the matrix is symmetric and all its eigenvalues are positive. This characteristic ensures that for any non-zero vector, the quadratic form associated with the matrix is positive, enabling stability in various applications such as optimization, statistics, and machine learning. Positive definite matrices play a critical role in ensuring well-defined solutions to problems, such as in the context of covariance matrices in statistics or energy minimization in optimization tasks.

Other Meanings for PD