Find the Power Set {0,1,2,3}

The power set of a set ${\displaystyle S}$ is the set of all subsets of ${\displaystyle S}$. The first subset will be set ${\displaystyle S}$ itself. Next, find all subsets that contain one less element (in this case ${\displaystyle 3}$ elements). Continue with this process until finding all subsets including the empty set.