By Doron Zeilberger
(Exclusively published in the Personal Journal of Shalosh B. Ekhad and Doron Zeilberger)
Written: 16 Nisan, 5777.
The Passover Haggadah is full of wonderful enumerative combinatorics (e.g. the multiplcation principle, where the number of "makot" gets increased exponentially by Rabbi Akiva and his buddies, while they were mesubim in Bnei Brak), but also elementary logic! God is a combinatorialist (and logician!).