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I took an APL course in 1979 at the University of Florida with Dr. Ralph ("Rafe") Selfridge. That was my first exposure to RPN. Though at the time I was neither a mathematics nor a comp-sci student, I really enjoyed APL and RPN. The latter came in handy when I bought an HP-48SX in the mid-'80s for use in calculus and other math classes I decided to take. I wish that little device had died on me. I found calculating using RPN much more natural than I might have expected. I'm sure that Kenneth Iverson believed it to be a wise approach to mathematical notation when he developed APL as a way to write/do/communicate mathematics and then later when the APL computer language was given life by IBM.
As for problems like the one mentioned in this article, their exfoliation online really burns my butt: my answer is to not write mathematics that no one who intended to convey an unambiguous mathematical idea would EVER write. Grouping symbols don't exactly cost extra $$ to use. :)