Many math symbols in LaTeX are accessed using commands which must only be used when TeX is typesetting math i.e., at a time when TeX is in math mode.Įxamples of commonly-used symbol commands include those for Greek letters: \alpha \((\alpha)\), \beta \((\beta)\), \gamma (\(\gamma)\), \delta \((\delta)\), \Delta \((\Delta)\) and so forth. Symbol commands must be used in math mode The following examples demonstrate some ways in which the Missing $ inserted error can be triggered, together with providing solutions to resolve the error.
Note: In this article we use the terms “TeX”, “LaTeX” and “TeX engine” but if you aren’t sure of their different meanings you can find out in the Overleaf article What's in a Name: A Guide to the Many Flavours of TeX. The latter parts of this article offer more in-depth material for readers wishing to broaden their understanding. We’ll start with an overview of the general conditions which trigger this error then list some of the more common causes and how to fix them. This error can be triggered in different ways and, especially for those new to LaTeX, it’s not always immediately obvious why it happened, or, more importantly, how to resolve it. 3 Advanced: An explanation of TeX’s error recovery mechanism.2.1 There are no missing $ signs but I still get the error.2 Background to the Missing $ inserted error.1.2.3 Using commands not permitted in math mode.1.2.2.1 Using underscores outside of math mode.1.2.2 Using math-mode-only characters outside math mode.
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