Ask HN: Math for hackers. 17 years ago
I would like to suggest the following books from
http://www.artofproblemsolving.com/Books/AoPS_B_Texts_FAQ.ph...
Start with following two books
the Art of Problem Solving, Volume 1: the Basics
the Art of Problem Solving, Volume 2: and Beyond
These will give you a solid grounding in mathematical problem solving.