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