{α : Type u_1} →
  {β : Type u_3} →
    {inst : PartialOrder α} →
      {inst_1 : PartialOrder β} →
        {p : Thunk (α × β)} →
          {ε : Type u_4} →
            {inst_2 : Estimator p ε} →
              {P : Sort u} → {inner inner' : ε} → { inner := inner } = { inner := inner' } → (inner ≍ inner' → P) → P