Any opinions as to PSR relating to vis viva? i believe Lwibniz sort of concocted the PSR as a sort of reductio in the first place, but it would be intesting to hear from someone with an insight to the principle's (INTEGRAL) relation to his post-Galiliean motion considerations, ie Galileo's purported experimental results with isochrony and an inverse square law. Upshot being: the mounting prevalence of systematism in physical nature being deserving of a base level principle for both their obviating prevalence, and their connectivity: hence the PRS & vis viva as well for that matter. perhaps someone more familiar with the dates could help clarify.