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Computer languages typically employ either prefix, infix, or postfix notation to capture the idea of applying an operator to arguments. For example, Postscript and Hewlett-Packard calculators use postfix notation. Most programing languages and computer algebra systems use the infix notation we are accustomed to seeing in print. However, the computer language LISP uses prefix notation, which also corresponds more closely to many natural language constructions like "f of x" and "subtract 5 from 8". For this and other reasons, MathML content mark-up also uses prefix notation.
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