Latex Undefined Sequence

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A typo when writing $ \alpha $ could be $ \Zlpha $

I want to include a space after the word \LaTeX\xspace but I have forgotten to load the xspace package.

An error will be generated if you write a file path as

C: \Users\Files

This error appears when L a T e X does not understand one of the commands you have used.

The most common causes of such an error are simple typos. An example of such a typo is shown below, where you accidentally pressed Z instead of a when writing \alpha


< \Zlpha

l.10 A typo when writing α α could be \Zlpha \Zlpha
The control sequence at the end of the top line
of your error message was never \def'ed. If you have
misspelled it (e.g., `\hobx'), type `I' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.

[1

These errors are easily spotted by humans but can cause LaTeX to get confused as to what is being asked.

Another cause of such an error is when a specific package is needed to use a certain command, but it is accidentally forgotten in the preamble. An example of this would be

In this example, the document will fail to compile as L a T e X doesn't recognize the \xspace command. This is not a typo, as \xspace is a perfectly fine command. The problem is that you have forgotten to include \usepackage{xspace} in the preamble. When this line is included, the error message will disappear as LaTeX now knows how to interpret the \xspace command.

Another cause of an Undefined Control Sequence error is a backslash used inappropriately. This can happen particularly when writing file links as shown below.

The issue is that when LaTeX sees a backslash \ , it interprets what follows as a command. Here, there is no such command as \Users, so you will get an Undefined Control Sequence error. To avoid this, when writing text you should write a backslash as \backslash . For writing long file paths and urls, it may sometimes be more convenient to use the url package rather than writing \backslash every time.


I am using imakeidx to make multiple indices for my report, but I ran into a problem where I get an “Undefined Control Sequence” error when I try to compile. The problem is shown below.

When I open the specified .ind file, I see this.

Considering I’ve never had to worry about .ind files before, I did not modify this file. The code that produces that index entry is here.

I’m not quite sure what is wrong with this declaration, since I’ve never had problems with imakeidx before.
Barbara Beeton pointed out ( https://tex.stackexchange.com/a/326635/220244 ) that | has a special function in index entries, which causes the problem.
This problem occurs, for example, if
Answered 3 days ago by Matthias with 0 upvote
the problem here is the presence of a | in a string that is being written into
an index entry.
the | has a special function in index entries: it substitutes for (and is
interpreted as) a backslash for commands that are relevant to the indexing
process, such as see (input as |see in index{...} ) or the "brackets"
that indicate a page span, |( and |) .
the proper way to input this character in an index entry depends on whether it
is in math or text.
in text, a | can be "quoted" by preceding it with a ditto mark: "| .
in math, the proper substitution is vert , or, if the
string to appear in the index output is || , then Vert . since these are
often paired, lvert ... rvert or abs{...} (or the equivalents for the
double forms) are often more appropriate.
Answered 3 days ago by barbara beeton with 3 upvotes
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https://www.overleaf.com/learn/latex/Errors/Undefined_control_sequence
https://asktowolrd.com/tex-latex/undefined-control-sequence-with-imakeidx/
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