Sigma supports the basic operators used to create calculations. The order the operations are performed in follow the mathematical order of operations.
Symbol  Description 
+  Adds two numbers 
  Subtracts one number from another 
*  Multiplies two numbers 
/  Divides one number by another 
^  Raises a number to the specified power 
% 
Modulo computes the remainder of dividing x by y

& 
Ampersand concatenates two strings together

< 
Returns whether X is less than y

=< 
Returns whether X is less than or equal to y

> 
Returns whether X is greater than y

>= 
Returns whether X is greater than or equal to y

= 
Returns whether x is equal to y

!=

Returns whether x is not equal to y

()  Used to change the order of operations 
AND  Returns whether two logical values are both TRUE 
OR 
Returns whether either of two logical values are both TRUE

NOT 
Used to negate and Expression

TRUE 
Interpreted as the Boolean literal TRUE

FALSE 
Interpreted as the Boolean literal FALSE

NULL 
Interpreted as a null literal
