Reverse Polish Notation
Date: 1/22/96 at 22:28:30 From: Anonymous Subject: Postfix Notation - Inventor Who invented PostFix notation, i.e. Reverse Polish Notation? Why is it called Reverse Polish Notation? Two HP48 owners
Date: 6/19/96 at 14:36:13 From: Doctor Mike Subject: Re: Postfix Notation - Inventor Hello HP48 owners, Polish Notation was created by the Polish mathematician Jan Lukasiewicz (Wu-ka-SHAVE-itch). It was first used for Logic to eliminate the need for parentheses within expressions like ((A and B) or C). There is an obvious parallel with numerical expressions like ((A + B) - C). The original(prefix) Polish Notation for this is -+ABC and it is AB+C- in (postfix) Reverse Polish Notation. A textbook on Logic (e.g., Copi or Prior) will explain this in more detail, or you can look at the on-line Museum of HP calculators at the following URL address: http://www.hpmuseum.org/ NOTE that the character before the dgh is the tilde symbol. Follow the Index link and select RPN links. I hope this helps. -Doctor Mike, The Math Forum
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