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Declare (comment), operators (Q)


A warning about using Declare.m:
while very useful most of the time, it somehow interferes with the
Algebra`SymbolicSum` package (at least in our MMa 2.2 version). For example,
with Declare:
In[1]:=<<Algebra`SymbolicSum`

In[2]:=Sum[k^2, {k, 1, n}]]
             2

Out[2]= Sum[k , {k, 1, n}]

without Declare:
In[1]:=<<Algebra`SymbolicSum`

In[2]:=Sum[k^2, {k, 1, n}]]

        n (1 + n) (1 + 2 n)
Out[2]= -------------------
                 6

Question:
how does one implement the operator (x d/dx)^k ?

Thanks,

--
Daniel

Fritz Haber Center for Molecular Dynamics
Hebrew University of Jerusalem








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