Basic Formula operators
+ - Addition
- - Subtraction
* - Multiplication
/ - Division
^ - Exponentiation
& - Concatenation
= - Logical comparison (equal to)
> - Logical comparison (greater than)
< - Logical comparison (less than)
>= - Logical comparison (greater than or equal to)
<= - Logical comparison (less than or equal to)
<> - Logical comparison (not equal to)
See also this tip in French: Opérateurs de formule de base.