I try to compile a TeX file and meet the following error:

<quote>
/opt/texlive/2021/texmf-dist/tex/latex/mathtools/mathtools.sty
(/opt/texlive/2021/texmf-dist/tex/latex/tools/calc.sty)
(/opt/texlive/2021/texmf-dist/tex/latex/mathtools/mhsetup.sty))
(/opt/texlive/2021/texmf-dist/tex/latex/stmaryrd/stmaryrd.sty))

! LaTeX Error: Command \C undefined.

See the LaTeX manual or LaTeX Companion for explanation.
Type H <return> for immediate help.
...

l.716 \renewcommand{\C}
{\mathbb{C}}
?
</quote>

The TeX file tested above is located at <https://github.com/hongyi-zhao/temp/blob/master/3410-latex-print-style.tex>.

Any hints for solving this problem will be highly appreciated.

Regards,
HY

Il Fri, 14 May 2021 06:07:59 -0700, hongy...@gmail.com ha scritto:

> I try to compile a TeX file and meet the following error:
>
> ! LaTeX Error: Command \C undefined.
>
> l.716 \renewcommand{\C}
> {\mathbb{C}}
> ?
> </quote>

The \C command is not defined. Instead of using \renewcommand try to use
\newcommand.

Ciao, Mauro

On Friday, May 14, 2021 at 9:30:17 PM UTC+8, Mauro Orlandini wrote:
> Il Fri, 14 May 2021 06:07:59 -0700, hongy...@gmail.com ha scritto:
>
> > I try to compile a TeX file and meet the following error:
> >
> > ! LaTeX Error: Command \C undefined.
> >
> > l.716 \renewcommand{\C}
> > {\mathbb{C}}
> > ?
> > </quote>
> The \C command is not defined. Instead of using \renewcommand try to use
> \newcommand.

Really it does the trick. To be frank, this TeX file is generated using the xsltproc tool based on the <https://github.com/sean-fitzpatrick/Math3410> project, as shown below:

$ xsltproc --stringparam publisher ../publication/publication.xml --xinclude ../../../rbeezer/mathbook.git/user/3410-latex-print-style.xsl ../ptx/3410notes.ptx -o 3410-latex-print-style.tex

See <https://github.com/sean-fitzpatrick/Math3410/issues/4> for more detailed info. But I still don't know what caused the problem reported here.

Regards,
HY

>
> Ciao, Mauro

On 14/05/2021 16:19, hongy...@gmail.com wrote:
> On Friday, May 14, 2021 at 9:30:17 PM UTC+8, Mauro Orlandini wrote:
>> Il Fri, 14 May 2021 06:07:59 -0700, hongy...@gmail.com ha scritto:
>>
>>> I try to compile a TeX file and meet the following error:
>>>
>>> ! LaTeX Error: Command \C undefined.
>>>
>>> l.716 \renewcommand{\C}
>>> {\mathbb{C}}
>>> ?
>>>
>> The \C command is not defined. Instead of using \renewcommand try to use
>> \newcommand.

Right. That would always be step #1.

> Really it does the trick. To be frank, this TeX file is generated
using the xsltproc tool based on the
<https://github.com/sean-fitzpatrick/Math3410> project, as shown below:

Using someone else's code almost always means they have made assumptions
about the packages you are using. In this case, I'd say the author
has lots of built-in packages that he uses daily, and he cannot conceive
of anyone ever NOT having the same set of packages --- one of which will
almost certainly define \C --- so he hasn't included them explicitly.

But as he hasn't told you any of this, you get an error and have to guess.

> But I still don't know what caused the problem reported here.

You will need to check out each of the packages HE loads and find out
which one defines \C.

Peter

Am Fri, 14 May 2021 08:19:28 -0700 (PDT) schrieb hongy...@gmail.com:

>> The \C command is not defined. Instead of using \renewcommand try to use
>> \newcommand.
>
> Really it does the trick.

> See <https://github.com/sean-fitzpatrick/Math3410/issues/4> for
> more detailed info. But I still don't know what caused the
> problem reported here.

Perhaps the code is relying on hyperref predefining \C, which it no
longer does by default.

--
Ulrike Fischer
https://www.troubleshooting-tex.de/

Mauro Orlandini wrote:
> Instead of using \renewcommand try to use \newcommand.

Yes but under different circumstances that may throw another error. In
thse cases it is safest to use both provide and renew in that order --
or only provide if you expect the other definition, if given, to be
superior.

--
/¯\ No | Dipl.-Ing. F. Axel Berger Tel: +49/ 221/ 7771 8067
\ / HTML | Roald-Amundsen-Straße 2a Fax: +49/ 221/ 7771 8069
 X in | D-50829 Köln-Ossendorf http://berger-odenthal.de
/ \ Mail | -- No unannounced, large, binary attachments, please! --