Hi guys, I am eagerly looking for books which contain a lot of problems with complete solutions. Please tell me the name of such books/resources for the following fields. Number theory Abstract Algebra Geometry & Topology Probability I mean books like Calculus Problem Solver or Advanced Calculus Problem Solver published by REA or 3000 Solved Problems in Calculus from Schaum’s Series. Please also advise me about studying mathematics because mathematics is not my major subject. I have BSc. degree in Electronic Engineering and recently I have got tremendous interest in mathematics (particularly pure mathematics) that now I want to study mathematics.