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Prof. Justus K. Mile, Tran., “A Characterization of Partial Isometries and Positive Operators in Hilbert Space”, JAMS, p. ABSTRACT No 02, Aug. 2026, Accessed: Nov. 06, 2026. [Online]. Available: https://jamsjournal.org/JAMS/article/view/characterization-partial-isometries-positive-operators-justus-mi