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In infix notation, unlike in prefix or postfix notations, parentheses surrounding groups of operands and operators are necessary to indicate the intended order in which operations are to be performed. In the absence of parentheses, certain precedence rules determine the order of operations. These are explained in the order of operations article.
- postfix notation, also called Reverse Polish notation
- prefix notation, also called Polish notation
- Shunting yard algorithm, used to convert infix notation to postfix notation or to a tree