2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/121174Invariant form of BK-factorization is presented, it is used for factorization of the LPDOs equivalent under gauge transformation and for construction of approximate factorization simplifying numerical simulsations with corresponding LPDEs of higher order11 pages, 7 figuresMathematical Physicstext