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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. enter image description here

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    Welcome. // For a start, apply this chapter: en.wikibooks.org/wiki/LaTeX/Mathematics . See also the Related links to the right.
    – MS-SPO
    Jan 23, 2023 at 8:46
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    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
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    Should the weird dots appear only for one particular equation or for all equations in the document?
    – campa
    Jan 23, 2023 at 8:51
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    Use the free version of Mathpix for this kind of problems.
    – projetmbc
    Jan 23, 2023 at 8:54
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    Thanks @projetmbc I didn't know Mathpix
    – gildux
    Jan 23, 2023 at 9:06

2 Answers 2

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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.)

enter image description here

\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
          & \qquad
          & 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}
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  • Hi :-). The OP want also the dots in number of equation. I think to enumitem package.
    – Sebastiano
    Jan 23, 2023 at 13:01
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    @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.
    – Sebastiano
    Jan 23, 2023 at 19:54
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    \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
3

Please try with:

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

enter image description here

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    If I'd copy your code, it won't compile, as important statements are missing. Please complete.
    – MS-SPO
    Jan 23, 2023 at 11:53
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    @MS-SPO I have completed the MWE.
    – Sebastiano
    Jan 23, 2023 at 12:48
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    @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
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    @Sebastiano Much thanks for your kindful edit, hats off
    – GowriSaro
    Jan 23, 2023 at 13:18
  • @Mico Thanks for your notification
    – GowriSaro
    Jan 23, 2023 at 13:19

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