exact h.pairwise_disjoint_of_indep_subsets (fun i ↦ inter_subset_left)
  (fun i ↦ hB.indep.inter_left _)
case intro.refine_1
ι : Type u_1
α : Type u_2
M : Matroid α
B✝ I J X X' Y Y' F : Set α
Xs Ys Js Is : ι → Set α
i j : ι
e f : α
h : M.SkewFamily Xs
B : Set α
hB : M.ModularBase B Xs
⊢ Pairwise (Disjoint on fun i => Xs i ∩ B)
no goals