Invariance of convex sets: An alternative proof and application to Black-Scholes operator. Gulf Journal of Mathematics, [S. l.], v. 13, n. 1, p. 101–109, 2022. DOI: 10.56947/gjom.v13i1.929. Disponível em: https://gjom.org/index.php/gjom/article/view/929. Acesso em: 11 nov. 2026.