ext a
n d : ℕ
inst✝ : NeZero d
⊢ ↑(Finset.Nat.antidiagonalTuple (Nat.succ n) d) = {w | Weight.sum w = d}
case h
n d : ℕ
inst✝ : NeZero d
a : Fin (Nat.succ n) → ℕ
⊢ a ∈ ↑(Finset.Nat.antidiagonalTuple (Nat.succ n) d) ↔ a ∈ {w | Weight.sum w = d}