# Level Sets of Single-Variable Functions

In the case of a function of one variable, a level set is the
set of points that are all sent to the same height by the function.
For example, the level set of 1 for a function *f*
is the set of all points *x* such that *f(x)=1*.
The level set of zero is the set containing the roots of *f*.

**Next: **Level Sets of Multivariable Functions

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