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Noun
prefix notation
Lukasiewicz notation
Polish notation
Definition: a parenthesis-free notation for forming mathematical expressions in which each operator precedes its operands
Definition: A notation for arithmetic (and logical) formulae in which operations (respectively, quantifiers and operands) are written immediately before their operands, used to avoid the need for parentheses; for example, 3 * (4 + 7) is written as * 3 + 4 7 and A AND B is written as AND A B.