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Very often, teachers don't understand the concepts very well either.

• kalid 15y ago
  Exactly. And ironically, we expect that to be the norm. "Oh, nobody gets imaginary numbers, let's just memorize it and move on." To me, that's a huge canary in the coal mine! Why aren't we stopping here and making sure we get it? It's like reading a sentence, not understanding the key vocabulary word, and moving on. Yes, you "read" it but did you get anything from it?