ϱ- TOPOLOGICAL OPERATORS IN TOPOLOGICAL SPACES . Science Journal of University of Zakho, [S. l.], v. 11, n. 3, p. 317– 322, 2023. DOI: 10.25271/sjuoz.2023.11.3.1117. Disponível em: https://sjuoz.uoz.edu.krd/index.php/sjuoz/article/view/1117. Acesso em: 5 nov. 2025.