Natural Such a functionality represents a partial function on naturals, where by the proof of even (n) might be viewed being a precondition. From the Cambridge English Corpus There is no true distinction between the same old to start with-order objects with the mathematical discourse - for instance naturals, sets https://vegetarianayurvedicremedies.school.blog/2025/09/03/cureayu-vegetarian-healthcare-products-natural-safe/