Definition:Root


 * Root (Analysis): If $y^m = x$ then $x = \sqrt[m] y$, and $x$ is the $m$th root of $y$.


 * Root of a polynomial: the roots of a polynomial $f$ are the values of $x$ for which $f \left({x}\right) = 0$.


 * Root of a mapping (or function): The roots of a mapping $f$ are the values of $x$ for which $f \left({x}\right) = 0$.


 * Root Node: A rooted tree is a tree which has a particular node distinguished from the others and called the root node, or just root.