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I have constructed the elements of the following 4x4 matrix solving some differential equation, namely "sol": \[Rho][t] := {{Subscript[\[Rho], gg][t] /. sol, 0, 0, Subscript[\[Rho], ge][t] /. sol}, {0, Subscript[\[Rho],...
Sorry! The problem was my code. It works here now. Thank you very much!