# How can I write this equation in latex?

in this image, how can I write this, the dots befor the number of equation, I mean how can write the second parts of equation, also the dots in number of equation.

• Welcome. // For a start, apply this chapter: en.wikibooks.org/wiki/LaTeX/Mathematics . See also the Related links to the right. Jan 23, 2023 at 8:46
• Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer.
– Community Bot
Jan 23, 2023 at 8:47
• Should the weird dots appear only for one particular equation or for all equations in the document? Jan 23, 2023 at 8:51
• Use the free version of Mathpix for this kind of problems. Jan 23, 2023 at 8:54
• Thanks @projetmbc I didn't know Mathpix Jan 23, 2023 at 9:06

Something like this?

(Note the use of \int\limits_a^{\alpha} in row 1 -- thanks, @SUTerliakov, for suggesting this! -- and of {\textstyle\int_a{\alpha} in row 2.)

\documentclass{article} % or some other suitable document class
\usepackage{amsmath}    % for 'alignat' env. and '\tag*' macro
\begin{document}

\begin{alignat}{2}
Q(\alpha) &= w(\alpha)+\gamma \int\limits_a^{\alpha}\!
Y(\alpha,\tau) Q(\tau)\,d\tau
& b_1\le \alpha \le b_2
\refstepcounter{equation} % increment the 'equation' counter
\tag*{\dots\ (\theequation)\hphantom{a}}\\
-w(\alpha)&= \gamma {\textstyle\int_a^{\alpha}}\,
Y(\alpha,\tau) Q(\tau)\,d\tau
&
& b_1\le \alpha \le b_2
\tag*{\dots\ (\theequation a)}
\end{alignat}

\end{document}

• Hi :-). The OP want also the dots in number of equation. I think to enumitem package. Jan 23, 2023 at 13:01
• @Sebastiano - Thanks for pointing out this extra requirement. I've updated my answer to include the dots.
– Mico
Jan 23, 2023 at 13:12
• You're always WELCOME. Jan 23, 2023 at 19:54
• \int\limits_a^\alpha would match the topmost equation typesetting closer: the limits are shown below and above the integral sign, not near it. Jan 23, 2023 at 20:18
• @SUTerliakov - Thanks for this suggestion! I've incorporated it in the answer.
– Mico
Jan 23, 2023 at 22:14

\documentclass[a4paper,12pt]{article}
\usepackage{amsmath,amssymb}
\begin{document}
\begin{align}
.... \tag*{\ldots(1)}\\
.... \tag*{\ldots(1a)}
\end{align}
\end{document}


• If I'd copy your code, it won't compile, as important statements are missing. Please complete. Jan 23, 2023 at 11:53
• @MS-SPO I have completed the MWE. Jan 23, 2023 at 12:48
• @Sebastiano - To get the alignment of the equation "numbers" to mimic the OP's screenshot, consider changing \tag*{\ldots(1)} to \tag*{\ldots(1)\hphantom{a}}. :-)
– Mico
Jan 23, 2023 at 13:14
• @Sebastiano Much thanks for your kindful edit, hats off Jan 23, 2023 at 13:18