https://www.cantorsparadise.com/the-10-most-important-mathematical-functions-and-their-families-d8ec4fb46684
https://www.youtube.com/watch?app=desktop&v=Dr_0zVrcZjQ&fbclid=IwAR2MYLg_8iusGZ3ppAHxU_U62mwVUN4zA0X8qIkk3uCKel-m0VxpbKDvqfY
https://dam.gcsp.ch/files/doc/geneva-paper-34-24?_gl=1*1sbxhik*_ga*MjEwOTkyNTQ2My4xNzE0NTc4ODQ4*_ga_Z66DSTVXTJ*MTcxNDU3ODg0OC4xLjAuMTcxNDU3ODg0OC42MC4wLjA.