2018/11/15(木)19時「大人の数学リベンジ!!!大人の余裕で数学に親しむ★Mathematics for fun」 https://tomosu-lab.com/2018/11/04/2018-11-15%e6%9c%a819%e6%99%82%e3%80%8c%e5%a4%a7%e4%ba%ba%e3%81%ae%e6%95%b0%e5%ad%a6%e3%83%aa%e3%83%99%e3%83%b3%e3%82%b8%ef%bc%81%ef%bc%81%ef%bc%81%e5%a4%a7%e4%ba%ba%e3%81%ae%e4%bd%99%e8%a3%95/