exact h.union_indep_of_indep_subsets hI Subset.rfl hJ Subset.rfl
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
hI : M.Indep I
hJ : M.Indep J
h : M.Skew I J
⊢ M.Indep (I ∪ J)
no goals