Theorem: Matroid.freeOn_not_circuit (Matroid/Circuit.lean)

State before:
α : Type u_1
M : Matroid α
C C' I X K C₁ C₂ R : Set α
e f x y : α
E✝ D E : Set α
⊢ ¬(freeOn E).Circuit C
Tactic:
simp [← uniqueBaseOn_self]
State after:
no goals