Дела учебные

I have a need to archive some of my postings I do for my classes somewhere. Word files proved to be not an ideal solution, so I think the easiest thing is just to post them here. I promise to hide the most specialized ones 'under the eye', but some of them can be left open, I think. Shouldn't be too bothersome.

( This one is about my personal philosophy of learning, not that I have much of it... )