## Quick Reference

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.

*Subjects:*
Philosophy — Computing.

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