A Collatz-type conjecture on the set of rational numbers

Details A Collatz-type conjecture on the set of rational numbers A Collatz-type conjecture on the set of rational numbers

2010-10-18

arxiv.org/abs/1010.3692v1

Mathematics

Number Theory

Scientific paper

Define $\theta(x)=(x-1)/3$ if $x\geq 1$, and $\theta(x)=2x/(1-x)$ if $x<1$. We conjecture that the orbit of every positive rational number ends in 0. In particular, there does not exist any positive rational fixed point for a map in the semigroup $\Omega$ generated by the maps $3x+1$ and $x/(x+2)$. In this paper, we prove that the asymptotic density of the set of elements in $\Omega$ that have rational fixed points is zero.

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