I don't think RPN lost. It was not the dominant solution, but it was mainstream. I'd say the situation was more similar to Android vs iOS. Many engineering stu

I don't think RPN lost. It was not the dominant solution, but it was mainstream. I'd say the situation was more similar to Android vs iOS. Many engineering students of all disciplines used HPs during the 1980-2000s. At some point, the HP 48 was everywhere in campus.