RUHAMA, Mustafa A. H. OPERATOR KOMPAK. Delta-Pi: Jurnal Matematika dan Pendidikan Matematika, [S. l.], v. 2, n. 1, 2016. DOI: 10.33387/dpi.v2i1.107. Disponível em: https://ejournal.unkhair.ac.id/index.php/deltapi/article/view/107. Acesso em: 24 jun. 2026.