Natural Such a operate signifies a partial functionality on naturals, wherever the evidence of even (n) might be viewed for a precondition. Through the Cambridge English Corpus There is not any serious difference between the usual 1st-order objects from the mathematical discourse - such as naturals, sets and so on https://safeherbalsupplement.blogspot.com/2025/08/trusted-cureayu-vegetarian-ayurvedic.html