Natural This kind of functionality signifies a partial operate on naturals, wherever the proof of even (n) could be observed being a precondition. From the Cambridge English Corpus There is not any serious distinction between the usual 1st-order objects from the mathematical discourse - like naturals, sets and so on https://cureayunaturalhealth.movie.blog/2025/09/03/cureayu-vegetarian-ayurvedic-remedies-for-everyday-health/