Hi, Just small link to the freetool that have some some part of symbolic comptuation: SolverQ 2.0. SolverQ is a program that solves equations. Equations are entered in natural form as text. It performs limited symbolic computation and presents graphic display of results. Together with installation comes about 40 lessons. As you move through these lessons you will learn some of the power of SolverQ. SolverQ represents a philosophy in which we feel the clarity of a problem formulation is paramount, and that solution details should be largely transparent to a user. SolverQ supports: solving nonlinear equations, repetitive solutions, graph plotting and exporting to EMF, complex and transcendental complex functions, symbolic simplification, symbolic differentiation, symbolic elimination, symbolic substitution, symbolic linearization (numeric), symbolic linearization (analytic), IF Statements, unconstrained and constrained optimization, regression, FFT's, differential equations, definite integral equations. Application is available as FREEWARE for Win 95/98/ME/NT/2000/XP and can be downloaded from: http://www.geocities.com/izudindz/SolverQ.zip Regards. _________________________________________________________________ Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp