what is the difference between function and relation?
http://wiki.answers.com/Q/What_is_the_difference_b...

A function of customer relations is to be an ambassador for the companyboth internally and externally. As such, customer relations personnel not only speak to current customers,
http://www.ehow.com/about_5396850_functionscustom...

A function is a special kind of relation. Relations pair up x
http://www.chacha.com/question/whatisthediffere...

The origin of the term is in this construction: take any arc of acute angle on a unit circle, and project that arc radially outwards onto a line tangent to the circle at one endpoint
http://www.quora.com/Mathematics/Howisthetangen...
