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Problem defining transformation rules



I wish to define a transformation rule in an input file that sets up the
following transformation (makes scalar commute with operator aR):

aR**(a_*ket[m_])->a*aR**ket[m]

However, I have not been able to accomplish this with either

1. ket/:  aR**(a_*ket[m_]) := a*aR**ket[m]

I get an error message that says: 
TagSetDelayed::"tagpos": 
    "Tag ket in (aR ** (ket[m_] a_) is too deep for an  assigned rule to
be found."

2. ket/: aR**(a_*ket[m_])->a*aR**ket[m]

Can someone help me out?  Thanks

cannon@centenary.edu


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Joel W. Cannon                 |   (318)869-5160          Dept. of
Physics               |   (318)869-5026  FAX    Centenary College of
Louisiana |       P. O. Box 41188		       |	     
Shreveport, LA 71134-1188      |      
                                     
                    




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