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Extended Expand and ExpandAll.


ExpandAll is a very useful function.  It doesn't however know how to
expand arbitary functions.  Imagine that I've got an F[a + b] which I
know is distributive and so,

    F[a_ + b_] -> F[a] + F[b].

Is there any way of letting Expand/ExpandAll know that it can also
expand F[] objects?

Joe
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