Frequently I see other TeX notes live or at least after a talk/class. Wouldn't this take a lot of time and effort? The point is that you want to encode the information for long term memory. So it seems that TeXing during a lecture is a distraction.
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closed as not a real question by Rudy the Reindeer, Asaf Karagila, rschwieb, Qiaochu Yuan Oct 19 '12 at 20:53
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I don't Live TeX, but ... different people learn differently. For some, the value of concentrating to produce a typeset version of the lectures notes may be most effective. For others, it may well be too distracting.
Similarly, some people like to sit back during a lecture or talk and try to absorb the big picture, confident they can later go back and pick up the relevant details. Others prefer to try to copy as much as they can down, presumably with the belief that keeping track of the details is the only way for them to see the big picture.
What's good for the moose isn't always good for the (sala)mander.