Informal writing from members of the algebra20 group — pure, applied, and math+AI.https://algebra20.de/enhttps://algebra20.de/notebook/welcome-to-the-notebook/https://algebra20.de/notebook/welcome-to-the-notebook/What this notebook is for, who writes in it, and the three audiences it tries to address.Sun, 17 May 2026 00:00:00 GMTpureappliedmath-ai