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I don't see a similar question so I'm posting this.

The file compiles fine if I delete [11pt] and let it default to 10pt.

  • I believe the format \documentclass[11pt][reqno]{amsbook} is correct
  • I believe 11pt is compatible with the document class amsbook
  • I did not read of a conflict between [regno] and typeface size

If it matters, the compiler is MikTex.

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  • 3
    Write \documentclass[11pt,reqno]{amsbook} instead of \documentclass[11pt][reqno]{amsbook}.
    – hair-splitter
    Jun 10, 2022 at 17:35
  • 2
    To generalize the previous comments, options on \documentclass must all be enclosed in the same set of brackets [ ] and separated by commas. (The options you wish to use are both defined; it's the input format that's not correct.)
    – barbara beeton
    Jun 10, 2022 at 18:30
  • Thank you all. Clearly, I was wrong - the format is incorrect. If one you would like to post the clarification as an answer I'll be happy to check it and add a point. BTW, the entry in my list of commands for \documentstyle doesn't say anything about all the options being inside one set of [ ] separated by commas. How do you folks find out these things!
    – TonyK
    Jun 10, 2022 at 19:04
  • any documentation that you have seen that said you could use [11pt] should have said what the syntax was, so the question is more where have you seen any suggestion that two options are possible there, we could get that documention fixed.
    – David Carlisle
    Jun 10, 2022 at 21:05
  • 1
    try learnlatex.org
    – David Carlisle
    Jun 11, 2022 at 0:02

1 Answer 1

Reset to default
3

The first optional argument of \documentclass takes a comma separated list of options.

So:

\documentclass[11pt,reqno]{amsbook}

\begin{document}
x
\end{document}

If you enter

\documentclass[11pt][reqno]{amsbook}

\begin{document}
x
\end{document}

Then essentially LaTeX sees

\documentclass[11pt]{}[

and fails to find a class file with empty name.

With an old release (2019 or older) you get the error

 LaTeX Error: File `.cls' not found.

With a current release, you get several internal errors as the new filehooks code fails on the empty filename.

! LaTeX hooks Error: Missing (empty) default label on line 1.
(hooks)              This command was ignored.

Type <return> to continue.
 ...                                              
                                                  
l.1 \documentclass[11pt][r
                          eqno]{amsbook}
?
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