Similar to 藤村の三角形問題

List of unsolved problems in statistics

Navier–Stokes existence and smoothness

Burnside problem

Pierce–Birkhoff conjecture

Beal conjecture

Hilbert's problems

Fermat–Catalan conjecture

Farrell–Jones conjecture

Hodge conjecture

Millennium Prize Problems

Yang–Mills existence and mass gap

Riemann hypothesis

Lychrel number

Class number problem

Ruth–Aaron pair

Einstein's constant

Artin–Rees lemma

Albanese variety

Alexander polynomial

List of things named after Alexander Grothendieck

Alexandrov theorem

Anscombe's quartet

Anderson–Darling test

Anne's theorem