Random functions from coupled dynamical systems
  Let $f:T\longrightarrow T$ be a mapping and $\Omega$ be a subset of $T$ which intersects every (positive) orbit of $f$. Assume that there are given a second dynamical system $\lambda:Y\longrightarrow Y$ and a mapping $\alpha:\Omega\longrightarrow Y$. For $t\in T$ let $\delta(t)$ be the smallest $k$ such that $f^k(t)\in\Omega$ and let $t_\Omega:=f^{\delta(t)}(t)$ be the first element in the orbit of $t$ which belongs to $\Omega$. Then we define a mapping $F:T\longrightarrow Y$ by $F(t):=\lambda^{\delta(t)}(t_\Omega)$. 
Lucilla Baldini, Josef Eschgf\"aller
math.CO math.NT