I am stuck on how on how to even begin this one. Thanks :) Solution HOPE YOU MEAN NATURAL NUMBERS BY N .. TO PROVE THAT ANY NON EMPTY SUB SET S OF NATURAL NUMBERS HAS A LEAST ELEMENT .. THAT IS TO PROVE THAT ANY NON EMPTY SUB SET S OF NATURAL NUMBERS CONTAINING NATURAL NUMBERS < M HAS A LEAST ELEMENT .. FOR ALL M < = S 1. CHECK FOR N=1 THAT IS S HAS ONLY ONE ELEMENT.