exact ⟨by rintro ⟨I, hI, rfl⟩; simpa, fun h ↦ ⟨_, h, by simp⟩⟩
α : Type u_1
β : Type u_2
f✝ : α → β
E I s : Set α
M : Matroid α
N : Matroid β
f : α ≃ β
B : Set β
⊢ (∃ B₀, M.Base B₀ ∧ B = ⇑f '' B₀) ↔ M.Base (⇑f.symm '' B)
no goals