Similar to スターリング数

Ackermann function

Partial permutation

Fisher–Yates shuffle

Lehmer code

Small set (combinatorics)

Sumset

Pentagonal number theorem

Catalan's constant

Q-analog

Kneser's theorem (combinatorics)

Sicherman dice

Singmaster's conjecture

Annales de Gergonne

P-adic Teichmüller theory

RSA (cryptosystem)

Vieta jumping

Witch of Agnesi

Abelian group

Category of abelian groups

Abelian category

Abelian variety

Abel's theorem

Abel equation

Abel–Jacobi map

Abel–Ruffini theorem