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A comment on Many elementary teachers don’t understand math, and it makes them anxious. Parent comment

Re:Many elementary teachers don’t understand math, and it ma... by applecrazy on Saturday November 30, 2019 @10:22AM (#21670322)
I think they're talking about this, which appeared in a front-page HN post from yesterday: https://en.wikipedia.org/wiki/Knuth%27s_up-arrow_notation
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Re:Many elementary teachers don’t understand math, and it ma... by pbhjpbhj on Sunday December 01, 2019 @02:47PM (#21677416)
Not that story in particular, it's a perennial story on HN - I first learnt about that notation through the "largest number you can write on a postit note" challenge.
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