Natural Such a functionality represents a partial function on naturals, where the evidence of even (n) could be seen like a precondition. In the Cambridge English Corpus There isn't any true difference between the standard initial-order objects with the mathematical discourse - for instance naturals, sets and so on - https://safeherbalsupplementsdailyuse.game.blog/2025/08/18/best-ayurvedic-brand-in-india-discover-cureayu-health-products/