Theorem: Matroid.Skew.disjoint_of_indep_subset_left (Matroid/Modular.lean)

State before:
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.Skew X Y
hI : M.Indep I
hIX : I ⊆ X
⊢ true ≠ false
Tactic:
simp
State after:
no goals