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First of all, my previous question was closed bcz it was considered as a duplicate. But it is not. I've checked for duplicate links and the link is irrelevant because it only discusses image numbering. So, i'll ask again for the same topic.

I want the numbered tag on \begin{align} based on the section.

So, for example if i have section 2.3 (2.3 means Chapter 2 and Section 3) my tag must be automatically 2.3.1, 2.3.2,, and so on.

Can you help me? Thanks in advance

My MWE:

\documentclass{book}
\usepackage{blindtext}
\usepackage{amsmath}

\begin{document}
\chapter{One}
\section{one}
\blindtext
\chapter{Two}
\section{one}
\blindtext
\section{two}
\blindtext
\section{three}
\begin{align}
c = \sqrt{a^2 + b^2}
\end{align}
\end{document}

To be clear the result of my equation should be:

View image

user516076
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    Your earlier query was a duplicate, as is this renewed posting. The link you refer to is not irrelevant. Indeed, it contains answers which suggest running either \counterwithin{equation}{section} or (since you employ the amsmath package) \numberwithin{equation}{section}. Since your document uses the book document class, either method produces the desired formatting of equation numbers. – Mico Aug 08 '20 at 03:16
  • @Mico there's a reason i'm not using begin{equation}. Cz one of my formulas using symbol "\" to enter. And some of them only tagged on the bottom. Not on the center, which \begin{align} is required. – user516076 Aug 08 '20 at 04:07
  • So, if it's possible, i only want using begin{align} but the numbered automatically based on the section. Thanks. Hope you can help me – user516076 Aug 08 '20 at 04:09
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    equation is both the name of a counter and the name of an environment. The equation counter is incremented by equation, align, gather, multline and quite a few more display-math environments. It's the counter's appearance that you need to modify. – Mico Aug 08 '20 at 04:11
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    @user516076 as mico says the same counter is used for equation and align so this is a duplicate. Also you should only use align when there are multiple lines and you specify alignment between them with &. Use equation for single line equations or you will get incorrect vertical spacing. – David Carlisle Aug 08 '20 at 08:24

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