Commands already defined

Question

I am getting the following problem

(/home/hagbard/Opstk/bld/texlive/2022/texmf-dist/tex/latex/amsmath/amsopn.sty)
! LaTeX Error: Command \iint already defined.
               Or name \end... illegal, see p.192 of the manual.
l.659 ...ewcommand{\iint}{\DOTSI\MultiIntegral{2}}

Here is an MWE

\documentclass[a4paper,11pt]{book}
\RequirePackage{wasysym}
\RequirePackage{amsmath}
\begin{document}
\chapter{Introduction}
This chapter's content...
\end{document}

amsmath conflicts with wasysym due to the redefinition of integrals in wasysym. Although using amsmath, I do not want to miss on the astronomical symbols provided by wasysym.

if you ask for all math to be set in font a then all math to be set in font b, then naturally that can not work but no one but you can decide which font you want. Just pick one not two. — David Carlisle, Aug 12 '23 at 12:55
but now you have removed marvosym there is no error from your example in texlive 2023 or 2022, or 2021 — David Carlisle, Aug 12 '23 at 12:57
I am trying to replicate the \iint already defined but I am not quite there yet. Do you think it is font related ? — Mahavir, Aug 12 '23 at 13:10
amsmath has specific code to avoid conflicting with stix, you should not get the errr from the code posted — David Carlisle, Aug 12 '23 at 13:12
With marvosym I get \Hermaphrodite error which is something different. — Mahavir, Aug 12 '23 at 13:12
No I do not get the error from the code posted as MWE requested. — Mahavir, Aug 12 '23 at 13:13
well that's not helpful:-) I suggest you delete until you have an example then undelete — David Carlisle, Aug 12 '23 at 13:14
Ok. This might be of value though l.659 ...ewcommand{\iint}{\DOTSI\MultiIntegral{2}} — Mahavir, Aug 12 '23 at 13:16
as i say if you load multiple packages all redefining the same commands such errors are expected. but can not guess which packages you are using if you show only unrelated code and a fragment of error message — David Carlisle, Aug 12 '23 at 13:18
They are bad packages then as they should not be made to conflict. — Mahavir, Aug 12 '23 at 13:20
that's just line 659 of amsmath, what you have not shown is how you defined \iint before loading amsmath — David Carlisle, Aug 12 '23 at 13:20
of couse they conflict, it is user error not a bad package. If one package says make math red and another package says make math green, neither package is wrong but it is user error to use both at the same time — David Carlisle, Aug 12 '23 at 13:23
I have not redefined the command myself, must be from the RequirePackage part. — Mahavir, Aug 12 '23 at 13:31
Looks like others have had the problem too, 4 years ago. [https://tex.stackexchange.com/questions/510948/error-command-iint-already-defined] — Mahavir, Aug 12 '23 at 13:33
I have figured out that the problem originated from \RequirePackage{wasysym}. — Mahavir, Aug 12 '23 at 13:42
It is quite a problem because I will miss the astronomical symbols. — Mahavir, Aug 12 '23 at 13:44
@Mahavir The "problem" is probably easy to solve if you were to show a test document which would allow other to reproduce the problem. No need to complain to anybody. In fact the package documentation tells you which option to use if you don't want the integral signs from wasysym... — samcarter_is_at_topanswers.xyz, Aug 12 '23 at 13:56
Load wasysym after amsmath: Problems with amsmath. Admittedly, the wasysym documentation contains a wrong statement. — campa, Aug 12 '23 at 14:14

samcarter_is_at_topanswers.xyz · Accepted Answer · 2023-08-12T15:54:30.627

1

Page 2 of the wasysym package documentation will tell you about the nointegrals option which avoids this conflict and let's you keep the normal integral signs (which might or might not be what you want):

\documentclass[a4paper,11pt]{book}
\RequirePackage[nointegrals]{wasysym}
\RequirePackage{amsmath}
\begin{document}
\chapter{Introduction}
This chapter's content...
\end{document}

edited Aug 12 '23 at 15:54

answered Aug 12 '23 at 14:32

samcarter_is_at_topanswers.xyz

158,329

I do not think packages should redefine things distributed by the Latex Project, but define new ones with the package name used as prefix. Same as done for Emacs Packages. – Mahavir Aug 12 '23 at 15:47
2

@Mahavir This would make a package for redefining symbols pretty useless. If it would use other macro names you couldn't reuse your equations in other documents. – samcarter_is_at_topanswers.xyz Aug 12 '23 at 15:55
Is it common that people don't like the equation rendering by the Latex Team ? If I am using a chemistry package, it would be good to know what I am using. – Mahavir Aug 13 '23 at 11:25
@Mahavir This won't change the rendering of equations, just the font of some symbols. – samcarter_is_at_topanswers.xyz Aug 13 '23 at 11:39

Commands already defined

1 Answers1