2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/44631We introduce two new sets of invariant functions of quark mass matrices, which express the constraints on these mass matrices due to knowledge of the quark mixing matrix. These invariants provide a very simple method to test candidate forms for mass matrices.5 pages (Latex), ITP-SB-92-38High Energy Physics - Phenomenologytext