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There are to ways in which the Collatz conjecture can fail:
These are the only two options because if any sequence has an upper bound, it must sooner or later repeat an element, leading to a cycle.

Ancestors (9)

  1. Collatz conjecture
  2. Famous conjecture
  3. Conjecture
  4. Open problem in mathematics
  5. Formal proof
  6. Formalization of mathematics
  7. Area of mathematics
  8. Mathematics
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