This allows you to perform mathematical operations on variables.

There are 2 types of operations that can be used:

**Comparison:** Whereby the variables are compared against each other as per the expression, and if it matches then a Yes result is returned.

**Calculation:** Whereby the result of the expression is calculated and the stored under the following session variable [[actionName:result]], this will also return as Yes.

The below table describes all possible math expressions you can define on .Control.

Math Expressions | Descriptions | Example |

+ - / * | Standard math calculations (plus, minus, divide, times) | a+b, a-b, a/b, a*b |

= > < >= <= | Standard comparison operators (equals, greater than, less than) | a=b, a>b, a>=b, a<b, a<=b |

!= | Not equals to comparison operator | a!=b |