intros ix bound H deltaIx GETIX
α : Type u_1
⊢ ∀ (ix bound : ℕ) (H : ix + length [] = bound) (deltaIx : ℕ) (GETIX : deltaIx < length []),
    getF (zipFlatIndexGo [] ix bound H) deltaIx (_ : deltaIx < length (zipFlatIndexGo [] ix bound H)) =
      (getF [] deltaIx GETIX, { ix := ix + deltaIx, h_ix_inbound := (_ : ix + deltaIx < bound) })
α : Type u_1
ix bound : ℕ
H : ix + length [] = bound
deltaIx : ℕ
GETIX : deltaIx < length []
⊢ getF (zipFlatIndexGo [] ix bound H) deltaIx (_ : deltaIx < length (zipFlatIndexGo [] ix bound H)) =
    (getF [] deltaIx GETIX, { ix := ix + deltaIx, h_ix_inbound := (_ : ix + deltaIx < bound) })