Natural This kind of operate signifies a partial operate on naturals, the place the proof of even (n) might be viewed for a precondition. Within the Cambridge English Corpus There's no real difference between the same old initial-order objects in the mathematical discourse - including naturals, sets and so on https://herbalandnaturalproducts.sport.blog/2025/09/03/cureayu-vegetarian-ayurvedic-remedies-for-everyday-health/