As part of a lengthy mathematical proof on density functions, part of the text says:
We know that given $\{x_n\}_{n\in N} \subset R $ such that que $ x_n\to z\in R^c$ , we have that the corresponding times $t(x_n)\to +\infty$, so $h_1(x_n)\to \infty$: This means that if we make $\rho(y)| \frac{\partial h_1}{\partial x} (h_1^{-1}(y))|\to 0 $ as $y\to \infty$ we will achieve continuity of $\bar\rho$ in $R^c$.
Forgettin about details, what is the meaning of que?