We begin to write an extensive document about equations and equation systems. The result should be in the style of a thesis or a book. We can use the last example in Chapter 8, *TypingMath Formulas*, where we dealt with theorems concerning equations.

- Create a new document. Inside this, load all the packages and specify the options, like we did in our preambles before. Use all the beneficial packages that we already learned about:
\usepackage[english]{babel} \usepackage[utf8]{inputenc} \usepackage[T1]{fontenc} \usepackage{lmodern} \usepackage{microtype} \usepackage{natbib} \usepackage{tocbibind} \usepackage{amsmath} \usepackage{amsthm} \newtheorem{thm}{Theorem}[chapter] \newtheorem{lem}[thm]{Lemma} ...

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