Natural Such a function represents a partial functionality on naturals, in which the proof of even (n) might be viewed being a precondition. With the Cambridge English Corpus There is no true difference between the usual initially-order objects on the mathematical discourse - like naturals, sets and so forth - https://ayurvedicremediesforlifestyledisorder.blogspot.com/2025/09/daily-health-supplements-online-shop.html