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Original Message (ID '157672') By Bill Simpson:
I am not certain I understand what you are trying to do. Will this do what you need? In[1]:= A[a]+B[b]F[f]K[a]-F[b]F[f]/K[k]/.{A[Except[a]]->1, B[Except[b]]->1, F[Except[f]]->1, K[Except[k]]->1} Out[1]= A[a] + B[b]*F[f] - F[f]/K[k] C, D, E, I, N, O and some other upper case single character names are defined for use by Mathematica. If you use those you will probably find problems or errors.