| 释义 |
positive semidefinite
positive semidefinite[′päz·əd·iv ¦sem·i′def·ə·nət] (mathematics) Also known as nonnegative semidefinite. A square matrix A is positive semidefinite if for every choice of complex numbers x1, x2, …, xn , where x̄j is the complex conjugate of xj . A linear operator T on an inner product space is positive semidefinite if 〈 Tu, u 〉 is equal to or greater than 0 for all vectors u in the space. |