Through a really nice and helpful math prof who took time out of her day to explain it to those in the "im in trouble" additional course. Forever grateful for that, would have failed otherwise.

Math notation becomes very readable, as soon as the teacher writes a example out on the black board, and that is why i will never forgive wikipedia / wolfram / latex for not having a interactive "notation to example expansion". They had such a chance to reform the medium - to make it more accessible to beginners and basically forgot about them.