most recent 30 from http://mathoverflow.net 2013-05-23T03:30:21Z http://mathoverflow.net/feeds/question/85044 http://www.creativecommons.org/licenses/by-nc/2.5/rdf http://mathoverflow.net/questions/85044/definition-of-relation john 2012-01-06T11:09:03Z 2012-01-06T11:09:03Z

<p>Many textbooks define the notion of relation using the notion of n-tuple. So here is my point:</p> <p>How can you define relation<br> using n-tuple if an n-tuple itself should be defined<br> using the notion of ordering (i.e a relation.) ?</p>