An MPP Monounary Algebra Induced by an Endomorphism of the Direct Product of Two Chains. European Journal of Pure and Applied Mathematics, Maryland, USA, v. 18, n. 3, p. 6538, 2025. DOI: 10.29020/nybg.ejpam.v18i3.6538. Disponível em: https://www.ejpam.com/index.php/ejpam/article/view/6538. Acesso em: 5 dec. 2025.