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Error Tracing - NDSolve


 Hi, 

is there any possibility in tracing an error in 
NDSolve ? 

I get the following message:

In[2]:=     sol =  NDSolve[ Union[equation, condini] , {y1,y2,y3} , {t, 0., 20.},
         MaxSteps -> 2000 ]
        
                                 1
Power::infy: Infinite expression -- encountered.
                                 0.

.... and unfortunately, the system seems to be well defined. 

 Thanks,

  a + andrei

PS I can send the entire file if there is a more precise interest
in the question.


______________________________________________________________________
  Andrei Constantinescu               constant at athena.polytechnique.fr   
                                                                       
  LMS Ecole Polytechnique                  tel:   (33)-1-69.33.33.30
  91128 PALAISEAU cedex - FRANCE           fax:   (33)-1-69.33.30.26    

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