rfl
case e_a.h
t : ℕ
P : ℕ → ℕ
h : Balanced t P
f : ℕ → ℕ
⊢ smallParts h = smallParts h

case e_a.a
t : ℕ
P : ℕ → ℕ
h : Balanced t P
f : ℕ → ℕ
⊢ ∀ (x : ℕ), x ∈ smallParts h → f (P x) = f (minP t P)
case e_a.a
t : ℕ
P : ℕ → ℕ
h : Balanced t P
f : ℕ → ℕ
⊢ ∀ (x : ℕ), x ∈ smallParts h → f (P x) = f (minP t P)