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[Newbie] Interpreting output


Hi everybody....

I'm having troubles in interpreting the output of Mathematica.

My problem is to define a function F(x,y,z) such that:
F = (whatever) if x>c
F=(whatever) if x<=c

I achievied this using /;

When I derive F with respect to one of the variables, the result is a mess.
Just an example with 1 variable:

f=x/;x>0;
f=-x^2/;x<0;

D[f,x]=-2Condition(1,0)[x^2,x<0]+Condition(1,0)[x^2,x<0]Less(1,0)[x,0]

Even in this very simple case, the result is a real mess:
I really do not know how should I read that...and I'm wondering if
I have defined the function in the right way.

Anybody so kind to explain me what's goung on?

Thank you very much for your patience




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