In mathematics, the term root can mean:
- The square root, the cube root, or more generally the nth root of a number.
- Any solution to a mathematical equation (see equation solving).
- A root of a function, i.e. an x-value for which the function produces a result of zero.
- A root of unity, a complex number which is an nth root of one.
- In graph theory, a rooted tree is tree with a distinguished node called the root.
- A root system of vectors, whose elements are called roots.
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