Theorem: Matroid.modularFamily_of_isEmpty (Matroid/Modular.lean)

State before:
ι : Type u_1
α : Type u_2
M : Matroid α
B I J X X' Y Y' F : Set α
Xs Ys Js Is : ι → Set α
i j : ι
e f : α
inst✝ : IsEmpty ι
⊢ ⋃ i, Xs i ⊆ ∅
Tactic:
simp
State after:
no goals