2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/59688Realization theory for operator colligations on Pontryagin spaces is used to study interpolation and factorization in generalized Schur classes. Several criteria are derived which imply that a given function is almost the restriction of a generalized Schur function. The role of realization theory in coefficient problems is also discussed.28 pagesFunctional Analysis47A57, 42A70text