📜 Theorem, law or theory

Collatz conjecture

Conjetura de Collatz

Date
1937 · confidence medium
Place
Hamburg, Germany
Credited to
Lothar Collatz
Field
Knowledge & symbols

What was discovered

Collatz proposed that, by repeatedly applying the rule of dividing even numbers by two and multiplying odd numbers by three and adding one, any positive integer eventually reaches 1. Despite its simple statement it remains unproven, and has spurred advances both in computational theory and, in 2019, a notable result by Terence Tao.

The exact place where Collatz formulated the conjecture is not precisely confirmed; he had received his doctorate two years earlier and is assumed to have been working in Germany.

What it led to

  • Numerous computational verification attempts
  • Terence Tao's result (2019)
  • Connections to computational complexity theory

Links

Sources✓ verified 2026-09-28