![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step1.JPG\")
Definition of a function :
\A function is a special type of relation in which each element of the domain is paired with exactly one element of the range.
\![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step2.JPG\")
The relation is ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=6a1f57d9f02d40dc9f74955fcead2698.png\")
.
The domain set is ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=c46af41827bbe7f2d12e5e43b6002137.png\")
.
The range set is ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=b4e92c6cc78843494e375eb41007b08f.png\")
. \ \
The relation is a function because each element of the domain is paired with exactly one element of the range.
\![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")
The relation is a function.