Th?u Hello?u th? gi?i và giao ti?p b?ng nhi?u ngôn ng? T?i ?ng d?ngA far more official assertion of the axiom of option is: the Cartesian product of every indexed family of nonempty sets is non empty.D?ch trong m?i ?ng d?ng B?t k? b?n ?ang dùng ?ng d?ng nào, ch? c?n sao chép v?n b?n r?i nh?n ?? d?chto ascertain for a rule; to furnish; to presc