Natural Such a operate signifies a partial purpose on naturals, in which the evidence of even (n) might be witnessed for a precondition. From your Cambridge English Corpus There is not any serious difference between the standard very first-order objects of your mathematical discourse - including naturals, sets and so https://share.evernote.com/note/b6ac86c4-49b5-8a83-fcdd-e9f84e4317c6