4

Sorry, real noob here... I just need to typeset the following equation. I found a way to split the too long equation into two lines, but now it does not typeset/give equation tag: why?

\begin{equation*}
    \begin{aligned}
    W [ & \text{inverse distance attraction} \\
    & \mid \text {elliptic orbits and the "second law"}] \approx 1 \label{a3}
    \end{aligned}
\end{equation*}

Equation without tag

I am using TeXShop on Mac Os X.

2
  • Welcome to TeX.SE.
    – Mico
    Commented Apr 28, 2021 at 10:19
  • Please not that in 99% of all latex questions, the editor is irrelevant
    – daleif
    Commented Apr 28, 2021 at 12:57

2 Answers 2

6

The equation* environment is untagged. Drop the asterisk and use equation instead.

1
  • Yes, thanks thats it!!!
    – Tere Vaden
    Commented Apr 28, 2021 at 9:48
5

I guess that you only need to remove the asterisk in the begin and end equation:

\begin{equation}
    \begin{aligned}
    W [ & \text{inverse distance attraction} \\
    & \mid \text {elliptic orbits and the ``second law''}] \approx 1 \label{a3}
    \end{aligned}
\end{equation}

Also, don't use the character ", called dumb double-quote marks, for typestting; use `` to open the quote and '' to close.

2
  • 1
    Yes, thanks thats it!!!
    – Tere Vaden
    Commented Apr 28, 2021 at 9:48
  • 2
    +1. I've taken the liberty of adding a sentence to your answer, to point out that one shouldn't use "dumb" (1"`) quotation marks in a LaTeX document. Feel free to revert.
    – Mico
    Commented Apr 28, 2021 at 10:25

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