On the Pythagorean orthogonality of Hilbert bounded linear operators. Gulf Journal of Mathematics, [S. l.], v. 15, n. 2, p. 148–151, 2023. DOI: 10.56947/gjom.v15i2.1605. Disponível em: https://www.gjom.org/index.php/gjom/article/view/1605. Acesso em: 19 aug. 2026.