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Jan 11, 2018 at 10:32 comment added Robert Frost Ah okay; a cycle having only one division by $4$ or greater. A non-unitary down-step. Containing no more than one integer satisfying $\lvert\cdot\rvert_2\in\{\frac{1}{4},\frac{1}{8}\}$
Jan 10, 2018 at 20:51 history edited Gottfried Helms CC BY-SA 3.0
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Jan 10, 2018 at 20:46 history edited Gottfried Helms CC BY-SA 3.0
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Jan 10, 2018 at 20:04 comment added Gottfried Helms @Robert : "1-cycle" does not mean "only one step" (in the syracuse notation) but "arbitrarily many steps going up only and then arbitrarily many steps going down only arriving at the initial value again". This is often misunderstood (my own first take with this included...) and so I think it is somehow a misnomer. There should a better name be invented sometime... The "1-step-loop" which you describe in your comment is indeed easily disproved (and even the 2-step and 3-step cycle and a couple of such finite-step cycles) see my treatize go.helms-net.de/math/collatz/Collatz061102.pdf
Jan 10, 2018 at 19:04 comment added Robert Frost Strange that somebody bothered to prove the trivial cycle is the only 1-cycle by such complex means when it's easily shown with basic algebra that $x=1$ is the only positive integer solution to $2^mx=3x+1$
Mar 10, 2017 at 3:10 history edited Gottfried Helms CC BY-SA 3.0
Updated link to the Simons/deWeger-paper
Jun 28, 2011 at 4:21 history edited Gottfried Helms CC BY-SA 3.0
corrected date of reference(Simons,2004)
Jun 26, 2011 at 9:25 history edited Gottfried Helms CC BY-SA 3.0
improving explanation
Jun 25, 2011 at 5:42 history edited Gottfried Helms CC BY-SA 3.0
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Jun 24, 2011 at 19:48 history edited Gottfried Helms CC BY-SA 3.0
corrected date of reference
Jun 24, 2011 at 19:33 history answered Gottfried Helms CC BY-SA 3.0