Variables and constants are simple. But there are more complex objects, like binomial coefficients, vectors, and matrices. We shall figure out how to typeset such structures. Let's begin with simple arrays.

For arranging math expressions within a surrounding expression, there's the **array** environment. We use it exactly like a `tabular`

environment. However, it requires math mode and all of its entries are made using the math mode as well.

For example, by using variable sized parentheses around the array:

\[ A = \left( \begin{array}{cc} a_{11} & a_{12} \\ a_{21} & a_{22} \end{array} \right) \]

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