> Reverse Polish Notation: The expression ( x − 2 ) ( x − 1 ) would be written instead × − x 2 − x 1 , or something like that. This is not reverse Polish no

> Reverse Polish Notation: The expression ( x − 2 ) ( x − 1 ) would be written instead × − x 2 − x 1 , or something like that. This is not reverse Polish notation. It's Polish notation; parentheses free prefix notation. The reverse would be x 2 － x 1 － ×.