constructor
ι : Type u_1
inst✝² : Fintype ι
inst✝¹ : DecidableEq ι
inst✝ : Encodable ι
α : Type u_2
f : ι → Option α
⊢ (∃ i, f (fintypeEquivFin.symm i) = none) ↔ ∃ i, f i = none
case mp
ι : Type u_1
inst✝² : Fintype ι
inst✝¹ : DecidableEq ι
inst✝ : Encodable ι
α : Type u_2
f : ι → Option α
⊢ (∃ i, f (fintypeEquivFin.symm i) = none) → ∃ i, f i = none

case mpr
ι : Type u_1
inst✝² : Fintype ι
inst✝¹ : DecidableEq ι
inst✝ : Encodable ι
α : Type u_2
f : ι → Option α
⊢ (∃ i, f i = none) → ∃ i, f (fintypeEquivFin.symm i) = none