2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/24376We develop a theory which describes hybrid structures consisting out of superconducting and ferromagnetic parts. We give two examples for applications. First, we consider a hybrid structure containing a strong ferromagnet in the ballistic limit. Second, we study for a weak ferromagnet the influence of a domain wall on the superconducting proximity effect. In both cases we account quantitatively for the mixing between singlet and triplet correlations.12 pages, 5 figures, to be publishedSuperconductivityMesoscale and Nanoscale Physicstext