2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/57625An analog of the classical Doppler effect is investigated in spaces (manifolds) whose tangent bundle is endowed with a transport along paths, which, in particular, can be parallel one. The obtained results are valid irrespectively to the particles mass, i.e. they hold for massless particles (e.g. photons) as well as for massive ones.9 LaTeX pages. For related papers, visit the "publication" pages at http://theo.inrne.bas.bg/~bozho/Mathematical PhysicsGeneral Relativity and Quantum Cosmology70B05 (Primary) 83C99, 83E99 (Secondary)text