Similar to ハウスドルフのパラドックス

Galois group

Kneser's theorem (combinatorics)

Cayley graph

Coxeter group

Tietze transformations

Ba space

Delta-ring

Sigma-ring

Vitali set

Vitali covering lemma

Cantor function

Krylov–Bogolyubov theorem

Peano–Jordan measure

Ω-consistent theory

Zermelo–Fraenkel set theory

Paradox

Cramer's paradox

Annales de Gergonne

P-adic Teichmüller theory

RSA (cryptosystem)

Witch of Agnesi

Abelian category

Abelian variety

Abel's theorem

Abel equation

Abel–Jacobi map

Abel–Ruffini theorem