![]() ![]() This is not permitted and generates an error. The following example tries to use the TeX command \vskip inside mathematical material. Although most users are unlikely to use these commands in day-to-day LaTeX code, we make a note here because it’s possible they could be contained within LaTeX commands (macros) being used in math mode. Using commands not permitted in math modeĪ number of low-level built-in TeX commands (called primitives) are not permitted in math mode and their use in math mode will trigger the Missing $ inserted error. Many other LaTeX commands, such as those for modifiers: \vec command. 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. TeXnically speaking: TeX detected a command designed to work outside math mode but you’ve tried to use it inside math mode.TeX has detected a command designed to be used only when TeX is not typesetting mathematics but that command was detected (used) whilst TeX was typesetting mathematical material.To clarify the issue with “characters” designed to work in math mode, what we really mean is using characters assigned certain category codes designed to operate inside mathematical material. TeXnically speaking: TeX detected a character or command designed to work inside math mode but you’ve tried to use it outside math mode.TeX has detected a character or command designed to be used only when TeX is typesetting mathematics but that character or command has been used when TeX was not typesetting mathematics.You’ve made an explicit error in your math markup, such as writing $y=f(x)$$-we look at other examples later in this article.There are three main reasons why (La)TeX generates this 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. ![]() 1.2.1.1 Fixing errors caused by LaTeX symbol commands.1.2.1 Symbol commands must be used in math mode.1.2 Examples of errors and their solutions.1.1 The main causes of Missing $ inserted.The xcolor package documentation (or access via texdoc.The color package documentation (or access via ).\nopagecolor will change the background back to normal. This is a switch command, meaning it will take effect in the entire document unless another switch command is used to revert it. \documentclass set the page colour to black. ![]()
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