In
mathematics, a
closed-form expression is a
mathematical expression that can be evaluated in a
finite number of operations. It may contain
constants,
variables, certain "well-known"
operations (e.g., + - × ÷), and
functions (e.g.,
nth root,
exponent,
logarithm,
trigonometric functions, and
inverse hyperbolic functions), but usually no
limit. The set of operations and functions admitted in a closed-form expression may vary with author and context.