  This paper provides a general proof of a relationship theorem between
nonlinear analogue polynomial equations and the corresponding Jacobian matrix,
presented recently by the present author. This theorem is also verified
generally effective for all nonlinear polynomial algebraic system of equations.
As two particular applications of this theorem, we gave a Newton formula
without requiring the evaluation of nonlinear function vector as well as a
simple formula to estimate the relative error of the approximate Jacobian
matrix. Finally, some possible applications of this theorem in nonlinear system
analysis are discussed.
