A mathematical expression expressed using a finite number of basic arithmetic operations over the numbers and elementary functions.

The key benefit of dealing with closed-form expressions is that they are

- well tabulated with precision enough for the majority of engineering applications
- implemented as fast-computable algorithms with computer precisions (usually 64 bit and 128 bit) on modern computers
- available as fast-computing algorithms with arbitrary user-defined precision

# See also

Formal science / Mathematics / Calculus