simp only [mem_support_append_iff, end_mem_support, start_mem_support, or_self_iff]
case mpr.intro.intro
V✝ : Type u
V' : Type v
V'' : Type w
G✝ : Digraph V✝
G' : Digraph V'
G'' : Digraph V''
inst✝ : DecidableEq V✝
V : Type u
G : Digraph V
u v w : V
q : Walk G u w
r : Walk G w v
⊢ w ∈ support (append q r)
no goals