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Rule Writing for x and 1/x

• To: MATHGROUP at christensen.cybernetics.net
• Subject: [mg785] Rule Writing for x and 1/x
• From: REECE_D <REECE+_D%A1%Electromagnetic_Sciences at mcimail.com>
• Date: Wed, 19 Apr 1995 00:29:51 -0400

   Is there a way to write a single rule in MMA which will turn J/s into W 
and s/J into 1/W?
   
   {J/s->W} only works for case#1.