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No one-avoiding eventual cycles

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CollatzMission.no_eventual_cycle_counterexamples

by mysticflounder · Sep 8, 2026 · Mathlib 0df444a (Lean v4.33.1)

collatzdynamical-systemsnumber-theory

No positive integer has a Collatz orbit that both avoids 111 at every iterate and eventually repeats with a positive period.

This is the cycle branch of the counterexample split.

Preamble
import Definitions.Def_CollatzMission
Formal statement
namespace CollatzMission

theorem no_eventual_cycle_counterexamples : NoEventualCycleCounterexamples := by
  sorry

end CollatzMission
Source
https://github.com/flound1129/collatz/blob/c0b24f073dcdc63d9d0974429bd8f3c522ed8eb4/lean/CollatzConjecture/Formulations.lean#L154-L173

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