Theorem: Matroid.Loop.skew (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
he : M.Loop e
hX : X ⊆ M.E
⊢ {e} ⊆ M.cl ∅
Tactic:
simpa
State after:
no goals