Math & Science ⇒ Equation not centered

[Cham]

Hm, using this code is apparently a solution, but the equation number is placed on a second line.

Code: Select all

\begin{equation}
  \makebox[\textwidth]{
    \text{SOME VERY VERY LONG AND LARGE EQUATION}
  }
\end{equation}

I would prefer to have the equation number on the same line as the equation.


Edit:
Ooops ! Using 0pt instead of \textwidth apparently solves my issue.

I think that we now have a nice solution.

[localghost]

[…] I think that we now have a nice solution.

Indeed, if you consider anti-typographical typesetting as nice solution. m(

[Cham]

[…] I think that we now have a nice solution.

Indeed, if you consider anti-typographical typesetting as nice solution. m(

Do you have a better solution ?

[cgnieder]

I believe the standard solution would be to split the equation into two lines:

Code: Select all

\documentclass[12pt,letterpaper,twoside]{book}
\usepackage[T1]{fontenc}
\usepackage{lmodern}
\usepackage{textcomp}
\usepackage{amsmath}
\makeatletter
\renewcommand\theequation{\thesection.\arabic{equation}}
\@addtoreset{equation}{section}
\makeatother

\begin{document}
\chapter{Title}
\section{Section title}
\subsection{Subsection}
Bla bla bla bla
\begin{equation}
 \frac{1}{2}\Delta(f_{ij}f^{ij})= 2\left(\sum_{i<j}\chi_{ij}(\sigma_{i}-
   \sigma_{j})^{2}+f^{ij}\nabla_{j}\nabla_{i}(\Delta f)+\right.
   \left.+\nabla_{k}f_{ij}\nabla^{k}f^{ij}+
   f^{ij}f^{k}\left[2\nabla_{i}R_{jk}-\nabla_{k}R_{ij}\right]\vphantom{\sum_{i<j}}\right)
\end{equation}
Bla bla bla.
\begin{multline}
 \frac{1}{2}\Delta(f_{ij}f^{ij})= 2\left(\sum_{i<j}\chi_{ij}(\sigma_{i}-
   \sigma_{j})^{2}+f^{ij}\nabla_{j}\nabla_{i}(\Delta f)+\right.\\% <= note the linebreak
   \left.+\nabla_{k}f_{ij}\nabla^{k}f^{ij}+
   f^{ij}f^{k}\left[2\nabla_{i}R_{jk}-\nabla_{k}R_{ij}\right]\vphantom{\sum_{i<j}}\right)
\end{multline}
Bla bla bla.
\end{document}

See the mathmode document for details.

Regards

[Cham]

Well, spliting the equation isn't an option in this case. Here's a screen capture of my special case problem :

alignment.jpg (90.78 KiB) Viewed 6194 times

As you can see, the first equation isn't THAT long. There's plenty of space around it. The equation number at its right is a bit long (but it isn't exagerated either). Yet, LaTeX pushes the equation to the left, so there's exactly the same space around it, on the left and on the right. The equation isn't centered relative to the text, while the second (a bit shorter) equation is well centered relative to the text.

I don't like that at all. I want the first equation to stay centered relative to the text, exactly like the second equation. See the glitches that I indicated in red.

There's enough space at the right of the first equation, so there wont be any overlap with its number.

For unknown reason, the \makebox[0pt] command gives me a compilation error and I didn't found a way yet to solve this issue.

For comparison, here's the same text and equations, with a different chapter numerotation. I don't have the issue in this case. This is what I want LaTeX to do (in this case only !) :

picture2.jpg (77.01 KiB) Viewed 6194 times

Any idea ?

[cgnieder]

Can you make an MWE containing these two equations showing the undesired behavior?

Regards

[Cham]

Here you go. This one exactly replicate the problem of the first equation.

Code: Select all

\documentclass[12pt,letterpaper,twoside]{book}
\usepackage[T1]{fontenc}
\usepackage{lmodern}
\usepackage{textcomp}
\usepackage{amsmath}
\usepackage{tensor}
\makeatletter
\renewcommand\theequation{\thesection.\arabic{equation}}
\@addtoreset{equation}{section}
\makeatother

\begin{document}
\chapter{Title}
\section{Section title}
\subsection{Subsection}
Bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla
	\begin{equation}
		\frac{d^2 \, \displaystyle{\tensor{x}{^{\lambda}}}}{d\, \sigma^2} + \Gamma_{\mu \nu}^{\lambda} \; \frac{d\, \displaystyle{\tensor{x}{^{\mu}}}}{d\, \sigma} \, \frac{d\, \displaystyle{\tensor{x}{^{\nu}}}}{d\, \sigma} = \frac{d\, \displaystyle{\tensor{x}{^{\lambda}}}}{d\, \sigma} \, \frac{d\, }{d\, \sigma} \, \ln \sqrt{\, \tensor{g}{_{\mu \nu}} \; \frac{d\, \displaystyle{\tensor{x}{^{\mu}}}}{d\, \sigma} \, \frac{d\, \displaystyle{\tensor{x}{^{\nu}}}}{d\, \sigma}}.
	\end{equation}
bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla
	\begin{equation}
		\tensor{g}{_{\mu \nu}} \; \frac{d\, \displaystyle{\tensor{x}{^{\mu}}}}{d\, \sigma} \, \frac{d\, \displaystyle{\tensor{x}{^{\nu}}}}{d\, \sigma} = \tensor{g}{_{\mu \nu}} \; \frac{d\, \displaystyle{\tensor{x}{^{\mu}}}}{d\, \tau} \, \frac{d\, \displaystyle{\tensor{x}{^{\nu}}}}{d\, \tau} \, \Big( \, \frac{d\, \tau}{d\, \sigma} \Big)^{\! 2} \equiv \Big( \, \frac{d\, \tau}{d\, \sigma} \Big)^{\! 2}.
	\end{equation}
bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla
\end{document}

Remove the section numbering, and the first equation move to the center (the second equation doesn't move). Add the section numbering, and the first equation is pushed to the left.

So the question is how to fix the first equation to the center (relative to the text) ?

[cgnieder]

Indeed, how interesting... and strange I thought at first. But I'm willing to bet that this has to do with some minimum space between equation and number. I was unable however where this space is defined and thus how to modify it...

Hopefully someone else knows.

Regards

[justdeath]

The problem is the tensor package. Replace all \tensor commands by g (or the required letter) and everything aligns fine. The package maintainer should fix his code.

Yeah, my mistake. It is a spacing problem.

With the following change it aligns fine:

Code: Select all

\renewcommand\theequation{\thesubsection.\arabic{equation}}

Not sure of the solution of the problem though.

jd

[cgnieder]

The problem is the tensor package. Replace all \tensor commands by g (or the required letter) and everything aligns fine.

No, it doesn't... it is still shifted to the left with the bigger tag.

Regards