theorem instRelationalQualityAtToParent
theorem instRelationalQualityAtToParent: ∀ (x t : Type) [RelationalQuality.At x t], Quality.At x t
theorem instRelationalQualityAtToParent
theorem instRelationalQualityAtToParent: ∀ (x t : Type) [RelationalQuality.At x t], Quality.At x t