The generalized Collatz orbit criterion

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Let m∈Nm\in\mathbb{N}, and let Col⁡\operatorname{Col} be the Collatz function defined by

Col⁡(x)={x2if x≡0(mod2),3x+1if x≡1(mod2).\operatorname{Col}(x)=\begin{cases}\frac{x}{2}&\text{if }x\equiv0\pmod 2,\\3x+1&\text{if }x\equiv1\pmod 2.\end{cases}

Consider the sequence Col⁡n(m)\operatorname{Col}^n(m) for n≥1n\geq1. Generalized Collatz conjecture. This sequence will reach 11 if and only if both of the following properties hold:

  1. lim⁡n→∞Col⁡n(m)∉{m}\displaystyle\lim_{n\to\infty}\operatorname{Col}^n(m)\notin\{m\}.
  2. lim⁡n→∞Col⁡n(m)≠∞\displaystyle\lim_{n\to\infty}\operatorname{Col}^n(m)\neq\infty.

This is presented as a reformulation of the Collatz conjecture in the source. The limiting conditions are not further clarified there, and no resolution or independent justification of the claimed equivalence is supplied.

References

Primary source

Benyamin Khanzadeh Holasou, “Collatz mapping on Z/10Z”, arXiv:2102.02650 (2021).

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