i want to make three recommendations for good materials dealing with mathematics.
target group are people that had math only school and did not study it at university.

why “in german”?
i don´t want to exclude anybody. i think that it´s not a big problem to get real good material in english. but if your´re form a country with an unpopular language like german you have to searge a bit more. so all the sources are at least in german and english.

real good if you left “school days” years behind you:
http://www.math.tu-berlin.de/OMB [math.tu-berlin.de]
it´s from the technical university in berlin (tu berlin). students take this corse before they start studying.
language: german and english.


G. Farin:
german: “Lineare Algebra: Ein geometrischer Zugang”
same in english: G. Farin: The Geometry Toolbox for Graphics and Modeling
this is really nice book if you want to learn something about matrixes. very easy explained! more adaptive than scientific!!!

i hope that it´s helping someone!
and might be that you can add other usefull (and not too scientivic) sources. what i´m still looking for is something about quaternions for rotations in cg.

greetings!