# Expression Functions

A function performs a calculation between values in order to produce another value. When functions are used in an expression, they aid in the expression's evaluation.

There are many function types that can be used when developing expressions. For more information, see:

- Expression Functions:
- Math
- Conversion
- Logical
- Text
- Date
- Time Span

## Examples

- To check if the difference between two variables has exceeded a limit of 100:
- ABS(a – b) > 100

- To calculate the maximum of two values:
- IF (a >= b, a, b)

- Pythagorean theorem:
- SQRT(POWER(a, 2) + POWER(b, 2)) > c