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What are some good books for learning stocks, bonds, derivatives e.t.c for beginner with a math background?
Not perhaps practically useful, but I found it conceptually useful to learn the basics of mathematical finance, a way of describing financial markets via probability theory and stochastic processes. It's a little like trying to understand horse racing by studying spherical horses rolling without friction in a vacuum, but it does give you some ways of thinking that may be more appealing to someone with a math background. For instance, there's the idea that shorting a stock is effectively owning negative shares. Option pricing is a common motivation. There's a brief introduction, at the advanced undergraduate level, in Durrett's Essentials of Stochastic Processes. At the graduate level, I liked Ruth Williams' Introduction to the Mathematics of Finance.