MathGroup Archive 2007

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Re: Fold and Cross

Just one more thing:

When working with scalar functions, you can directly assign to 
Derviative, e.g.

In[1]:= Derivative[1][f] = g
Out[1]= g

In[2]:= f'[x]
Out[2]= g[x]

See the doc page tutorial/DefiningDerivatives

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