Ironically, I am severely dyscalculic, and my knowledge of mathematics (and mathematical symbols) is woefully inadequate. I somehow intuited that the right-hand expression might mean "average". Hmm... "average of bears"... "brain greater than"... oh, right, "smarter than the average bear!" (I've never actually seen any Yogi Bear cartoons, but the expression has been part of American cultural awareness for a long time, which is why I got it sort of wrong anyway.)
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