[Tex/LaTex] Equation numbers are not showing

equationsnumbering

I am writing a science report and using the format:

\[
\int_{I_0}^I \frac{dI}{I} = ...etc. \label{eqn:myEquation}
\]

No labels are printing next to the equations
If I later \ref{eqn:myEquation} it gives the subsection number that I am working in, this is the same for multiple equations.
I don't really want to use \begin{equation} and \end{equation} as there is lots of math and it will become quite cumbersome.
I was under the impression that \[ \] was the correct way to enter math mode and label an equation? I have done that before with no problems.

Best Answer

\[ produces an un-numbered math display.

you want

\begin{equation}
...
\end{equation}

To get a numbered equation that you can reference with \label/\ref

Related Solutions

[Tex/LaTex] Main label in a system of equations

You can use empheq together with amsmath and its subequations environment.

\documentclass{book}
\usepackage{amsmath,empheq}
\usepackage{hyperref}

\begin{document}

\begin{subequations}\label{eq:system}
\begin{empheq}[left=\empheqlbrace]{align}
  &\frac{d\psi}{d\zeta} = \frac{m_1}{y_1'}(x_1-\beta y_1') \label{eq:dpsidz}
  \\
  &\frac{dx_i}{d\zeta} = \frac{m_i}{\psi y_i'}(x_i-y_i')(x_i-\beta y_i')
    \qquad \forall i=1,\dots,C-1 \label{eq:dxdz}
  \\
  &0 = y_1' (x_j-\beta y_j')-\alpha_{1j}y_j'(x_1-\beta y_1')
    \qquad \forall j=2,\dots,C \label{eq:algeb1}
  \\
  &0 = \sum_{i=1}^{C}y_i' -1 \label{eq:algeb2}
  \\
  &\psi|_{\zeta=0} = 1
  \\
  &x_i|_{\zeta=0} = x_i^F \qquad \forall i=1,\dots,C
\end{empheq}
\end{subequations}
The system illustrated in \ref{eq:system} is a \textsc{dae} system 
with a differential index equal to~$1$.

\end{document}

With hyperref the anchor will be immediately above the system.

A couple of stylistic notes:

instead of ... you should input \dots;
instead of \prime you should use ^{\prime} or the easier ' (apostrophe) as in the code above.

Best Answer

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[Tex/LaTex] Main label in a system of equations

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