Similar to ナビエ–ストークス方程式の解の存在と滑らかさ

Andrica's conjecture

Erdős–Straus conjecture

Isomorphism problem of Coxeter groups

Collatz conjecture

Conway's 99-graph problem

Smale's problems

Moving sofa problem

List of unsolved problems in statistics

Burnside problem

Pierce–Birkhoff conjecture

Beal conjecture

Fermat–Catalan conjecture

Kobon triangle problem

Farrell–Jones conjecture

Lychrel number

Class number problem

Ruth–Aaron pair

Mathematics

0.999...

Zero-dimensional space

Zero to the power of zero

One-dimensional space

1 + 1 + 1 + 1 + ⋯

1 + 2 + 3 + 4 + ⋯

1 + 2 + 4 + 8 + ⋯

Root of unity

Ones' complement