Question: Substituting indexes by an operator

Dear Maple community,

I am trying to define an operator in Maple that multiplies to an expression and substitutes the indices.

The issue is that I don't want to add the expression as input of the operator/function, sth like:

p := proc(i, j, z) option operator; subs({i = j, j = i}, z); end proc

I want it to act on expression, like:


and X can be any tensor or matrix.

Thanks in advance.

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