When writing multi-line equations with the align, align* or aligned environments, the \left and \right commands must be balanced on each line and on the same side of &. Therefore the following code snippet will fail with errors:

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The solution is to use "invisible" brackets to balance things out, i.e. adding a \right. at the end of the first line, and a \left. at the start of the second line after &:

The commands \Biggl and \biggr establish the size of the delimiters < and > respectively, with the l or r indicating whether it's the left or the right parenthesis. For a complete list of parentheses and sizes see the reference guide.

Parentheses and brackets are very common in mathematical formulas. You can easily control the size and style of brackets in LaTeX; this article explains how.

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\[ F = G \left( \frac{m_1 m_2}{r^2} \right) \] Notice that to insert the parentheses or brackets, the \left and \right commands are used. Even if you are using only one bracket, both commands are mandatory. \left and \right can dynamically adjust the size, as shown by the next example:

The size of brackets and parentheses can be manually set, or they can be resized dynamically in your document, as shown in the next example:

“Aspheric.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/aspheric. Accessed 11 Nov. 2024.