A Characterization of Partial Isometries and Positive Operators in Hilbert Space. Journal of Advanced Multidisciplinary Studies (JAMS), [S. l.], p. ABSTRACT No 02, 2026. Disponível em: https://jamsjournal.org/JAMS/article/view/characterization-partial-isometries-positive-operators-justus-mi. Acesso em: 21 sep. 2026.