Natural Such a purpose represents a partial function on naturals, where by the proof of even (n) could be viewed as a precondition. In the Cambridge English Corpus There isn't a authentic difference between the usual initial-order objects of your mathematical discourse - which include naturals, sets and so on https://buypilescurecapsules.code.blog/2025/09/03/cureayu-vegetarian-ayurvedic-remedies-for-everyday-health/