Simulate galactic rotation calculations with various autaxic priciples (esp arbitrary decimal precision to mitigate implied discretization) and compare with published results to show how dark matter may simply be a calculation or precision error, especially given localized gravity needed for GR (meaning we'd need to know it to model/calculate it, not infer from redshifted CMB, distant observations) yet gross incompleteness/imprecision of assuming Newtonian physics