Theorem: Digraph.Walk.coe_support_append (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 w : V
p : Walk G u v
p' : Walk G v w
⊢ ↑(support (append p p')) = {u} + ↑(List.tail (support p)) + ↑(List.tail (support p'))
Tactic:
rw [support_append, ← Multiset.coe_add, coe_support]
State after:
no goals