Packing entropy for fixed-point free flows – NASA/ADS Post author By Mark Post date March 15, 2021 Let $(X,\phi)$ be a compact flow without fixed points. We define the packing topological entropy $h_{\mathrm{top}}^P(\phi,K)$ on subsets of $X$ … read more ← NASA’s VIPER Lunar Rover looks to launch in 2023 → Nasa’s post about a ‘supermassive black hole’ in our Milky Way wows people