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Unformatted text preview: HP-12C TUTORIALTZYXThe HP automatic memory stack and its associated logic, RPN, is the most efficient method available for solving complex problems. RPN, HP's logic system, was named in honor of a logic notation devised by the Polish mathematician Jan Lukasiewicz. In 1951, he showed that arbitrary mathematical expressions could be specified unambiguously without parentheses. Originally developed to make the evaluation of algebraic expressions as simple as possible, RPN has been implemented in HP calculators be means of the stack and postfix operators. The term "postfix operators" simply means that you specify the operation to be performed after, rather than before, you specify the number or numbers involved. RPN enables you to see all intermediate answers, to recover easily from errors, to reuse numbers without reentering them, to solve problems one step at a time, and to evaluate virtually any expression without copying and remembering parentheses....
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- Spring '08