Typesetting math formulas with standard LaTeX

TeX is designed so that it can handle complex mathematical expressions. It’s also important, it’s designed in such a way that most of these expressions are easy to input. The general idea is to compose a complicated formula from less complicated formulas by putting them together in a simple way. The complexity of such combinations decreases as the formula is being decomposed until we come to some atomic elements of the formula. From the typist’s point of view, if you can type simple formulas and combine them into larger ones, you can handle any formula at all. And LaTeX, being a macro extension of TeX, makes it even easier to do certain things. We will start with simple formulas.