If you go to a bookstore, see a bunch of different textbooks on a subject, buy one at random, and learn the subject from the textbook, how much credit does the textbook writer deserve?
They might also have learned what you taught them from another source, but you were still the one that they happened to have learned from.
If you go to a bookstore, see a bunch of different textbooks on a subject, buy one at random, and learn the subject from the textbook, how much credit does the textbook writer deserve?
They might also have learned what you taught them from another source, but you were still the one that they happened to have learned from.