TI copyright

From the BA II Plus calculator manual:

When you choose the chain (Chn) calculation method, the calculator solves problems in the order that you enter them. (Most financial calculators use Chn.) 
Using AOS(TM) (algebraic operating system), the calculator solves problems according to the standard rules of algebraic hierarchy, computing multiplication and division operations before addition and subtraction operations. (Most scientific calculators use AOS.)

In other words, TI is trying to trademark PEMDAS.

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