[om] Need help to encode one math expression in OpenMath!

[Nobuki Takayama]

>>                                       m+n
>>                                      d        3
>>                                    ------ (x y  z)
>>                                      m  n
>>                                    dx dy
I would like to note that the contributed CD "weylalgebra1" gives 
a way to express this by using the symbol "act".

<CDDefinition>
<Name> act </Name>
<Description>
  action of a differential operator to a function.
</Description>

Nobuki Takayama,  OpenXM/fb project (OpenXM digital formula book project.)
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