exact fun i hiA ↦ (biInter_subset_of_mem hiA).trans (h i hiA).subset_cl
α : Type u_1
ι✝ : Type u_2
M : Matroid α
F I J X✝ Y B C R : Set α
e f x y : α
Xs Ys : Set (Set α)
ι : Type u_3
hI : M.Indep I
X : ι → Set α
A : Set ι
hA : A.Nonempty
h : ∀ i ∈ A, M.Basis (X i ∩ I) (X i)
⊢ ∀ i ∈ A, ⋂ i ∈ A, X i ⊆ M.cl (X i ∩ I)
no goals