obtain ⟨B, hB⟩ := h
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
h : M.ModularFamily Xs
he : ∀ (i : ι), M.LoopEquiv (Xs i) (Ys i)
⊢ M.ModularFamily Ys
case intro
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
he : ∀ (i : ι), M.LoopEquiv (Xs i) (Ys i)
B : Set α
hB : M.ModularBase B Xs
⊢ M.ModularFamily Ys