SciTech-Mathmatics-automatic equation Numbering \$\begin{equation} / \tag{E} / \label{E} / \\ref{E} \\end{equation}

official docs:
https://docs.mathjax.org/en/latest/input/tex/eqnumbers.html
ote that the AMS environments come in two forms: starred and unstarred. The unstarred versions produce equation numbers (when tags is set to 'ams') and the starred ones don’t. For example

\begin{equation}
   E = mc^2
\end{equation}

will be numbered,

while

\begin{equation*}
   e^{\pi i} + 1 = 0
\end{equation*}

will not be numbered (when tags is 'ams').

You can use \label to give an equation an identifier that you can use to refer to it later,
and then use \ref or \eqref within your document to insert the actual equation number at that location,
as a reference. For example,

\begin{equation}
  \int_0^\infty \frac{x^3}{e^x-1}\,dx = \frac{\pi^4}{15}
  \label{eq:sample}
\end{equation}

includes a labeled equation and a reference to that equation.

Note that references can come before the corresponding formula as well as after them.

You can configure the way that numbers are displayed,
and how the references to them by including the \(tagformat\) extension,
and setting options within the \(tagformat\ block\) of your tex configuration.
See the tagformat extension for more details.

If you are using \(automatic\ equation\ numbering\) and modifying the page dynamically, you can run into problems due to duplicate labels.
See Resetting Automatic Equation Numbering for how to address this.

NOTE: do enclosing the numbering equations and the "\tag" and "\label" using
\begin {equation} and \\end{equation}