Natural Such a purpose signifies a partial functionality on naturals, where by the evidence of even (n) could be witnessed for a precondition. Within the Cambridge English Corpus There's no serious difference between the usual first-order objects of the mathematical discourse - such as naturals, sets and so on - https://www.reddit.com/user/Similar-Taste2681/comments/1n7axgg/safe_herbal_supplements_for_daily_use_buy_from/