If you enjoyed this article, I’d like to ask for your support. Scientific American has served as an advocate for science and industry for 180 years, and right now may be the most critical moment in ...

1 Department of Mathematics, Gamal Abdel Nasser University, Conakry, Republic of Guinea. 2 Department of Mathematics, University of N’zérékoré, N’zérékoré, Republic of Guinea. 3 Guinea Research and ...