2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/77794Modified universal R-matrices, associated with the central extension (through the Drinfeld's double construction) of the quantum groups U_q(sl_n), are realized through an infinite dimensional spectral parameter dependent solution for the tetrahedron equation, provided a certain identity on $q$-exponentials holds true.11 pages, no figures, latex2eQuantum Algebra17B37text