MathGroup Archive 1996

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Piecewise Functions

I am trying to use Mma to solve a model where the system behaves a 
certain way up to a point, and an entirely different way after that 
point.  The result is something like:


This part I can get to work no problem.  For part of my analysis, I would 
like to take the derivative of the function, but all I get is an identity



Can anyone help?

|                            |   I understand mine's a risky plan,
|   Greg Anderson            |   and your system can't miss
|   dwarf at        |   but is security, after all a cause
|   timbwolf at     |   or symptom of happiness.
|                            |   
+----------------------------+   Dream Theater -- A Matter of Time


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