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ODE plus Algebraic eqns


Hello mathgroup: 
  
     The more general formulation of NDSolve[ ] is to solve a system of
coupled nonlinear ordinary differential equations (initial value problem)
with algebraic equations (or called constraints).  Is there any package
of Mma in the world, which can solve the general formulism which is 
usually taken place in the transistor-based electric circuit analysis.
     Any suggestion or information will be greatly appreciated. Thanks in
advance!!! 

                                        Yours Sincerely,
 
                                      Lee Yi-Kuen
                                Institute of Applied Mechanics
                                National Taiwan University
                                r1gauss at spring.iam.ntu.edu.tw
                                r1509046 at ccms.ntu.edu.tw





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