Theorem: Matroid.LoopEquiv.subset_iff_of_indep (Matroid/Loop.lean)

State before:
α : Type u_1
β : Type u_2
M N : Matroid α
e f : α
B L L' I X Y Z F C K : Set α
h : M.LoopEquiv X Y
hI : M.Indep I
⊢ I ⊆ X ↔ I ⊆ Y
Tactic:
rw [← sdiff_eq_left.2 hI.disjoint_loops, diff_subset_iff, diff_subset_iff,
  union_comm, h.union_eq_union, union_comm]
State after:
no goals