∀ {V : Type u} (G H : SimpleGraph V) (h : H ≤ G) (v : V) [inst : Fintype ↑((SimpleGraph.toSubgraph H h).neighborSet v)]
  [inst_1 : Fintype ↑(H.neighborSet v)], Fintype.card ↑((SimpleGraph.toSubgraph H h).neighborSet v) = H.degree v