Natural Such a operate represents a partial operate on naturals, where by the evidence of even (n) might be seen being a precondition. Within the Cambridge English Corpus There isn't any true distinction between the standard 1st-order objects with the mathematical discourse - which include naturals, sets and so on https://share.evernote.com/note/f5ed0f3d-3352-3d51-727d-10fa609eb157