Positive eigenvalues for the adjoint of an increasing operator. Electronic Journal of Applied Mathematics, [S. l.], v. 3, n. 2, p. 30–37, 2025. DOI: 10.61383/ejam.202532109. Disponível em: https://ejamjournal.com/index.php/ejam/article/view/ejam.202532109. Acesso em: 7 mar. 2026.