Speaking of mental leaps (see the patton and Macarthur thread):
It was an advanced physics course and the professor was more of a researcher and should never have been teaching. In one class, he begins to explain some theorem and fills a blackboard with equations. He goes on, "therefore it is obvious that" and fills another blackboard with equations.
One student raises his hand and says he didn't understand how to get from the first blackboard to the second.
The professor mumbles a bit, then goes to a third blackboard and begins, "you see how we got to this right?" The student agrees. "Well, from this you get this" and he starts writing equations again. Eventually he fills two more blackboards.
"See", he says to the student. "I was right. It was obvious."
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