Ask questions in class! I said it on Monday, and I guess I should have said it again today.
I didn't even notice that I'd used epsilon and "is an element of", two different mathematical symbols that look very similar, and that there might be confusion. If you have a question of the form "what is so-and-so / what does so-and-so mean?" it (1) is surely a question somebody else has in this 200-strong class and (2) is very easy to answer quickly, no trouble at all!
There were maybe 5 questions in class today. I'd be happier with 50, even -- especially -- if they're as simple as the above. Even if they're complicated, go for it.
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