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I have three variables $p_w, p_i, p_f$. I want to construct a matrix whose entries are members are rational polynomials in these variables and perform computations with this matrix (ultimately diagonalize it and obtain a general formula for its $n$-th power). But I want to do this computation symbolically, treating the three variables as transcendental elements adjoined to $\mathbb Q$. How an I do this?