2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/57217A backward biorthogonalization approach is proposed, which modifies biorthogonal functions so as to generate orthogonal projections onto a reduced subspace. The technique is relevant to problems amenable to be represented by a general linear model. In particular, problems of data compression, noise reduction and sparse representations may be tackled by the proposed approach.Mathematical PhysicsFunctional Analysistext