On the autonomisation of differential equations I: Sundman transformations for Painlevé equations I-IV

We consider the application of Sundman transformations to the first four Painlevé equations $P_I$-$P_{IV}$, with $P_V$ and $P_{VI}$ being left for future work. Since the Painlevé equations are nonautonomous, this requires first of all the construction of an equivalent autonomous system, a process wh