Natural This kind of function signifies a partial operate on naturals, where the proof of even (n) could possibly be viewed as a precondition. From the Cambridge English Corpus There is no real distinction between the same old to start with-order objects of the mathematical discourse - for instance naturals, https://buyherbalmedicines.business.blog/2025/09/03/cureayu-natural-healthcare-solutions-for-mind-body-balance/