Natural This kind of functionality signifies a partial functionality on naturals, where the proof of even (n) might be observed being a precondition. With the Cambridge English Corpus There's no serious difference between the usual initially-order objects in the mathematical discourse - for instance naturals, sets and so on - https://stonecarecapsulesforkidney.blogspot.com/2025/08/cureayu-reliable-ayurvedic-medicine-for.html