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Re: f + g


>...
> The sort of thing I
> have in mind is a general rule such as
> 
>     (f_ + g_)[x_] := f[x] + g[x]
>...

How about using Through? For example:

In[1]:=
Through[(f+g)[x]]

Out[1]=
f[x]+g[x]

=============================================================================

Dr Stephen P Luttrell                  luttrell at signal.dra.hmg.gb
Adaptive Systems Theory                01684-894046 (phone)
Room EX21, Defence Research Agency     01684-894384 (fax)           
Malvern, Worcs, WR14 3PS, U.K.        
http://www.dra.hmg.gb/cis5pip/Welcome.html


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