Coonstruction of an automorphism of an abelian group that satisfies the property of the weak extension without satisfying the property of the extension. Gulf Journal of Mathematics, [S. l.], v. 4, n. 4, 2016. DOI: 10.56947/gjom.v4i4.261. Disponível em: https://gjom.org/index.php/gjom/article/view/261. Acesso em: 15 oct. 2026.