rw [tail_support_append, List.mem_append]
V : Type u
V' : Type v
V'' : Type w
G : Digraph V
G' : Digraph V'
G'' : Digraph V''
t u v w : V
p : Walk G u v
p' : Walk G v w
⊢ t ∈ List.tail (support (append p p')) ↔ t ∈ List.tail (support p) ∨ t ∈ List.tail (support p')
no goals