Natural This kind of function represents a partial function on naturals, in which the proof of even (n) may be found as a precondition. From the Cambridge English Corpus There is not any real distinction between the same old 1st-order objects in the mathematical discourse - which include naturals, sets https://hair2glowhaircare.blogspot.com/2025/09/cureayu-top-ayurvedic-brand-for.html