Many people, even investors, are afraid of math … or at least uncomfortable with it. But myself, I’ve always liked math—there’s a certainty to it, and given that everything in the stock market is totally uncertain, it’s nice to be able to rely on a trusty partner. (In fact, I actually was planning on getting a minor in math in college, and the first handful of classes—calculus one, two and three, etc.—were no problem. But I specifically remember, at the start of a semester, going to exactly two classes of Linear Algebra (whatever that is), listening to my professor...