Is RPN still relevant?

[ijabbott]

(12-17-2023 09:33 PM)dm319 Wrote:  I don't think it's that hard. What helps is being able to see most of the stack. Then the function you press is simply applied to either the bottom number or the bottom two numbers. At the risk of kicking off an argument, I think the NSTK mode without the automatic stack lift is more intuitive to new users.

Indeed, a four-level stack is an artifice that has no place in teaching or learning mathematics. The NSTK mode opens other avenues, such as thinking about how computers work internally.