simp only [surround, path_to_base_eq, Category.assoc, IsIso.inv_hom_id_assoc,
IsIso.hom_inv_id_assoc, IsIso.hom_inv_id]
V : Type u_1
E : Type u_2
G : Graph V E
Γ : SpanningSubtree G
u v : V
p : u ⟶ v
⊢ surround Γ p ≫ surround Γ (inv p) = 𝟙 (base Γ)
no goals