Theorem: Digraph.Walk.length_support (GraphProjects/DigraphConnectivity.lean)

State before:
V : Type u
V' : Type v
V'' : Type w
G : Digraph V
G' : Digraph V'
G'' : Digraph V''
u v : V
p : Walk G u v
⊢ List.length (support p) = length p + 1
Tactic:
induction p <;> simp [*]
State after:
no goals