Theorem: Matroid.Flat.covBy_iff_wcovBy_and_ne (Matroid/Flat.lean)

State before:
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
hF₀ : M.Flat F₀
hF₁ : M.Flat F₁
⊢ F₀ ⋖[M] F₁ ↔ (F₀ ⩿[M] F₁) ∧ F₀ ≠ F₁
Tactic:
rw [show F₀ = (hF₀.toFlatOf : Set α) from rfl, show F₁ = (hF₁.toFlatOf : Set α) from rfl,
  ← FlatOf.covBy_iff, ← FlatOf.wcovBy_iff, _root_.covBy_iff_wcovBy_and_ne, ne_eq, ne_eq,
  FlatOf.coe_inj]
State after:
no goals