RPN

RPN (an acronym for Reverse Polish Notation) is method of entering input in to a calculator without the use of parenthesis. Reverse Polish Notation is more appropriately referred to as Operator Postfix Notation. Many engineers use this form of inputing, for it is more logical and less key strokes to enter complex equations. This notation is found in many HP models.

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HP48@

RPN Calculators - Calculators in Reverse Polish Notation, but with different approaches, different functions, different methods.
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User Friendly the Comic Strip - about RPN. A good way of explaining RPN with three picture frames. (Note: Erwin is an AI entity that frequently has been moved to different computers and his previous home was a Sun Workstation.)
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Eric Smith's HP Calculator Info - Technically page about older HP calculators with simulators for HP-41 and 45 calculators. With links to other calculator-related pages, journal articles, and US patents.
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