cognitive psychology. PhD 
I'm doing Advent of Code this year to learn Q. For bewildering one-liners, you can follow along here:https://github.com/willcrichton/aoc2021 …
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f/ (unary) is bottom-up fixed point iteration, which is cool! But how is it analogous to f/ (binary)? That, I don't see...
My guess: both are about iteratively computing on an element to a final point. For binary functions on lists, then it's reduce to one element. For unary functions on any type, then it's iterate-to-fixpoint. But I agree it's a bit of a stretch.