PLAZA, Ángel. Proof without words: partial sum and sum of a geometric series. Teaching Mathematics and Computer Science, [S. l.], v. 2, n. 2, p. 423, 2004. DOI: 10.5485/TMCS.2004.0075. Disponível em: https://ojs.lib.unideb.hu/tmcs/article/view/14734. Acesso em: 27 sep. 2024.