Explore Domain on MathWorld

(1) In analysis, the domain of a function is the set of values for which a function is defined. (2) In topology, a domain is a connected, open set.

Domain is a high school-level concept that would be first encountered in a pre-calculus course covering functions. It is listed in the California State Standards for Algebra I.


Function: A function is a relation that uniquely associates members of one set with members of another set. The term "function" is sometimes implicitly understood to mean continuous function, linear function, or function into the complex numbers.

Classroom Articles on Functions

  • Inverse Function
  • Range

  • Classroom Articles on Pre-Calculus (Up to High School Level)

  • Asymptote
  • Natural Logarithm
  • Complex Conjugate
  • Normal Vector
  • Complex Number
  • Parabola
  • Complex Plane
  • Parametric Equations
  • Conic Section
  • Plane
  • Cross Product
  • Plane Curve
  • Curve
  • Polar Coordinates
  • Determinant
  • Rational Function
  • Dot Product
  • Reflection
  • e
  • Rotation
  • Ellipse
  • Rotation Matrix
  • Exponential Function
  • Scalar
  • Hyperbola
  • Spherical Coordinates
  • i
  • Tangent Line
  • Imaginary Number
  • Translation
  • Locus
  • Vector
  • Logarithm