Theorem: Matroid.skew_of_subset_loops (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
L : Set α
hL : L ⊆ M.cl ∅
hX : X ⊆ M.E
⊢ M.Skew L X
Tactic:
rw [skew_iff_diff_loops_skew_left, diff_eq_empty.2 hL]
State after:
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
L : Set α
hL : L ⊆ M.cl ∅
hX : X ⊆ M.E
⊢ M.Skew ∅ X

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
L : Set α
hL : L ⊆ M.cl ∅
hX : X ⊆ M.E
⊢ M.Skew ∅ X
Tactic:
apply empty_skew hX
State after:
no goals