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The following simple operator is not working: tem1 = (q + Subscript[WOther, 1]) Z[w_] = tem1 /. { Subscript[WOther, 1] -> w_} Z[3] Rule::rhs: Pattern w_ appears on the right-hand side of rule Z[w_]->q+w_. q + w_ q + Pattern[3, _] I also tried...