van der Waals perturbation theory for fermion and boson ground-state matter

Using computer algebraic symbolic manipulation techniques, we rearrange the ideal-gas-based low-density expansions for the ground-state energy of a many-fermion and a many-boson system interacting via arbitrary pair central forces, into a repulsive-core-fluid-based perturbation expansion. Applications through second order are reported for liquid ${}_{}{}^4{}_{}{}^{}\mathrm{He}$ and liquid ${}_{}{}^3{}_{}{}^{}\mathrm{He}$.