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Thanks for Ed Keefe's article on Reverse Polish Notation (RPN). Algebraic notation may work the way you write, but RPN works the way you think, and that's what's important in a hand-held calculator. Anyone who believes otherwise should keep track of the number of times they go back and insert extra parentheses while writing an equation -- easy with a pencil, but not with a calculator keyboard.

Reversing the decline in popularity of RPN requires more than increased awareness of its advantages. I would love for HP to market an RPN calculator similar in size to the diminutive "shirtpocket" calculators.

I.L Tyler

Ashland OH, USA

iPhone Life magazine

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