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LCD is different to e-ink. I don't know what e-paper is, but I strongly suspect a marketing term.
Andrea and eggrz, I think that for maths/physics text/reference books, a tablet is best considering current technology. It is quicker and easier to skip through pages, copy and paste, write notes, etc. Also I'm not sure how well LaTex docs would render in an ereader. It's been a long while since I used it and I can't remember how well it exported. It's no doubt changed in that time as well. However if you have editable LaTex files, couldn't you resize it to fit a 5" or 6" or whatever size screen? Then reflow becomes a non-issue. Of course you will have many more pages then, which could be a pain if you want to flick back to an earlier equation or comment. Personally, I still like paper for scientific articles, especially where diagrams or equations are involved.
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