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How to substitute?
\!\(\((y\_0 - z\_3)\)\ \((\(-y\_1\) + z\_3)\)\ \((\(-y\_2\) + z\_3)\)\ \((\(-y\_3\) + z\_3)\)\) I have output cells containing various expressions such as (y-z) (y-z) (y - z), where I use [x] here to mean subscript. The integers can have any small values. For compactness of expression, I want to make substitutions which make the above expression look like Q[0,1]Q[1,2]Q[4,0]. There are many combinations of subscript pairs and I don't want to write explicit substitution rules for every possible combination. I tried doing /.(y[i]-z[j]) -> Q[i,j] , and /.(y[i_]-z[j_]) -> Q[i,j] but they don't work. Any suggestions will be gratefully received.