2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/65755There exist operators $A$ such that : for any sequence of contractions $\{A_n\}$, there is a total sequence of mutually orthogonal projections $\{E_n\}$ such that $ΣE_nAE_n=\bigoplus A_n$.11 pagesFunctional Analysis47A12; 47A20text