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Polish notation

Polish notation (prefix notation) A form of notation, invented by the Polish mathematician Jan Lukasiewicz, in which each operator precedes its operands, e.g. a + b is expressed as +ab

If all operators take exactly two operands, or if each operator has a specific number of operands, then no brackets are required since the order of evaluation is always uniquely defined; the notation can then be described as parenthesis-free. See also reverse Polish notation.

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