Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. In mathematics, Sylvester''s criterion is a necessary and sufficient criterion to determine whether a Hermitian matrix is positive-definite. It is named after James Joseph Sylvester.Sylvester''s criterion states that a Hermitian matrix M is positive-definite if and only if all the following matrices have a positive determinant:The proof is only for nonsingular Hermitian matrix with coefficients in Rnxn, therefore only for nonsingular real-symmetric matricesStatement III: If the real-symmetric matrix A is positive definite then A possess factorization of the form A=BTB, where B is nonsingular (Theorem I), the expression A=BTB implies thah A possess factorization of the form A=RTR (Statement II), therefore all the leading principal minors of A are positive (Statement I).