Theorem: Matroid.LoopEquiv.exists_diff_union_loops (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
⊢ Y = (X ∪ Y \ X) \ (X \ Y)
Tactic:
aesop
State after:
no goals