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Re: simple Problem: D[ ]

You are not defining your function properly. You should write:
f[x_]=x^2.  (You need the underscore character).  I think you would be
helped by reading some basic material on Mathematica such as section 1.7.1
of the Wolfram book.

Seth J. Chandler

"Christian Maier" <maier1 at> wrote in message
news:96t91a$pqt at
> I use mathmatica the first time and have a problem with a deriviation:
> in a simple problem:
> f[x]=x^2
> abl=D[f[x],x]
> then Mathematica puts out f[x]'    , but not 2 x
> How does it work correctly?
> Thank aou in advance!
> Christian Maier

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