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Jul 28 at 21:06 comment added Ferca Sure!, I edited the code op /: op[f_*expx_] /; FreeQ[expx, c] := f*op[expx], so that the special variable declared is c.
Jul 28 at 21:04 history edited Ferca CC BY-SA 4.0
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Jul 28 at 18:51 comment added user475525 Thank you for your answer. It appears that x is declared as a special variable instead of c. Is it possible to go the other way around?
Jul 27 at 8:54 history answered Ferca CC BY-SA 4.0