Md matrix

Mark R. Chassin, M.D., FACP, M.P.P., M.P.H., is president and chief executive officer of The Joint Commission. In this role, he oversees the activities of the nation. An n n complex matrix A is called positive definite if R x^ Ax 0 (1) for all nonzero complex vectors x in C^n, where x^ denotes the conjugate transpose