Theorem: Matroid.Iso.apply_symm_apply_mem (Matroid/Old/_Equiv.lean)

State before:
α : Type u_1
β : Type u_2
γ : Type u_3
α₁ : Type u_4
α₂ : Type u_5
α₃ : Type u_6
M : Matroid α
N : Matroid β
B I D X Y : Set α
e : M.Iso N
x : α
hx : x ∈ M.E
⊢ x ∈ e.toPartialEquiv.source
Tactic:
rwa [e.source_eq]
State after:
no goals