Which product design innovation first introduced the Reverse Polish Notation (RPN) interface to mainstream mathematical calculators, significantly changing how users input complex equations?

The design of mathematical tools and calculators has evolved dramatically over centuries. From ancient abacuses to modern digital devices, the interface design principles have shaped how we interact with mathematics. This poll tests your knowledge about a pivotal moment in mathematical product design history that revolutionized how students and professionals approach complex calculations.

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• The HP-35 scientific calculator (1972)
• The Texas Instruments TI-30 (1976)
• The Casio fx-7000G graphing calculator (1985)
• The Sharp EL-5020 programmable calculator (1978)

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