incomplete \ifodd , all text was ignored... error

Question

shall you please help me to know why here I have got an error ? :

\begin{document}

\begin{equation}\label{3-6}
\begin{aligned}
\overline{\epsilon}_{ij}  = \frac{1}{V} \int_V \epsilon}_{ij} dV\\
\overline{\sigma}_{ij}  = \frac{1}{V} \int_V \sigma}_{ij} dV
\end{aligned}
\end{equation}

\end{document}

@azetina Both the _{...} and the ^{...} bits are optional after \int. — egreg, Apr 03 '15 at 20:15

score 6 · Accepted Answer · answered Apr 03 '15 at 20:11

6

First, you have opening braces missing in the right hand side of your equation. Second, if you use aligned, you'd better provide & as alignment markers.

This works:

\documentclass{amsart}
\begin{document}

\begin{equation}\label{3-6}
\begin{aligned}
\overline{\epsilon}_{ij}  &= \frac{1}{V} \int_V {\epsilon}_{ij} dV\\
\overline{\sigma}_{ij}  &= \frac{1}{V} \int_V {\sigma}_{ij} dV
\end{aligned}
\end{equation}

\end{document}

answered Apr 03 '15 at 20:11

Boris

38,129

thank you ,so the class : amsart is obligatory to add, I add it to my settings as well? cause I don't have it in my code – Farzad64 Apr 03 '15 at 20:12
this is how I used :
\documentclass[11pt,a4paper,twoside,openright]{report}
– Farzad64 Apr 03 '15 at 20:13
1

You need either amsart class or \usepackage{amsmath} to use aligned. – Boris Apr 03 '15 at 20:13
1

@Farzad64 The amsart class loads amsmath; with other classes you need \usepackage{amsmath}. – egreg Apr 03 '15 at 20:14

incomplete \ifodd , all text was ignored... error

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