# polish notation (PN)

The Polish Notation. Poloish Notation (PN) is the formal program statement according to which mathematical formulas are written programmatically.

In Polish notation, the operator is entered first, followed by the operand. Example (a+b)*(a-b) is written in Polish notation: * +ab -ab. Because of this notation, Polish notation, developed by mathematician L. Lukaszewics, is called prefix notation.

In reverse Polish notation (UNP), on the other hand, the operand is entered first, followed by the operator.