AOS (Algenraic, Operating, System)
The Algebraic Operating System (AOS) is a calculator input method developed by Texas Instruments (TI) that allows users to enter complex mathematical expressions in the same order they are written (infix notation), while automatically respecting algebraic hierarchy (PEMDAS/BODMAS).
Introduced in September 1975 with the SR-52 programmable calculator, AOS was designed to compete with Hewlett-Packard's Reverse Polish Notation (RPN) by allowing users to enter formulas naturally without rearranging operands.
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