The residual class of the Z7 ring and the seven musical notes with its agreements: A mathematical teaching and learning process in basic education. Research, Society and Development, [S. l.], v. 10, n. 6, p. e6210615548, 2021. DOI: 10.33448/rsd-v10i6.15548. Disponível em: https://www.rsdjournal.org/rsd/article/view/15548. Acesso em: 5 dec. 2025.