2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/72005We prove Gray--Moser stability theorems for complementary pairs of forms of constant class defining symplectic pairs, contact-symplectic pairs and contact pairs. We also consider the case of contact-symplectic and contact-contact structures, in which the constant class condition on a one-form is replaced by the condition that its kernel hyperplane distribution have constant class in the sense of E. Cartan.to appear in International Mathematics Research NoticesSymplectic GeometryGeometric Topology53C15, 57R17, 57R30text