A notation for arithmetic (and rational) formulae which operations (correspondingly, quantifiers and operands) are written straight away before their operands, used to avoid the requirement for parentheses; including, 3 * (4 + 7) is created as * 3 + 4 7 and A AND B is written as AND A B.

a parenthesis-free notation for creating mathematical expressions for which each operator precedes its operands

## How would you define Polish notation?