Natural This kind of perform represents a partial function on naturals, where the proof of even (n) may very well be noticed like a precondition. From your Cambridge English Corpus There isn't a real difference between the standard to start with-order objects of your mathematical discourse - like naturals, sets https://onlineherbalmedicines.blogspot.com/2025/08/cureayu-reliable-ayurvedic-medicine-for.html