We generalize the decomposition of $U_q(mathfrak g)$ introduced by A. Joseph and relate it, for $mathfrak g$ semisimple, to the celebrated computation of central elements due to V. Drinfeld. In that case we construct a natural basis in the center of $U_q(mathfrak g)$ whose elements behave as Schur polynomials and thus explicitly identify the center with the ring of symmetric functions.
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