exact subset_union_left.trans (hF.symm.subset.trans (M.cl_subset_ground _))
α : Type u_1
M : Matroid α
I F X Y F' F₀ F₁ F₂ P L H H₁ H₂ H' B C K : Set α
e f : α
hF : M.cl (F ∪ M.cl C) = F ∪ C ∩ M.E
⊢ F ⊆ M.E
no goals