Clearly people think my question detracts from the value of HN because they're downvoting it, but to me it's worth it to investigate a place where the opinion of the "community" differs so radically from mine.
I have zero interest in finding out what people think of summation notation, or bra and ket notation, and, quite frankly, I find it inconceivable (and I do mean that, unlike Vizzini) that programmers would care what non-programmers think about CamelCase.
Still, you're being up-voted, I'm being down-voted, so obviously people really are interested in that. I'm mystified, but I'll accept it as a data point.
ADDED IN EDIT after reading the comment by benatkin to the above:
I am genuinely surprised, confused and puzzled. I'll have to re-think my model of what the HN readers think satisfies PG's outline of "On-Topic":
Anything that good hackers would find interesting ...
gratifies one's intellectual curiosity.
I'm going away to ponder the response, feeling somewhat bruised and punished by the "community" I thought I understood and felt at home in.