perf: enable equation numbering in MathJax (#1520 )

If you place your equations inside $$\begin{equation}...\end{equation}$$
you will get MathJax equation numbering. As described here:
https://docs.mathjax.org/en/latest/input/tex/eqnumbers.html

BREAKING CHANGES: if you used \begin{equation} inside $$ you will
get equation numbering which was not previously present.

2024-01-31 03:44:19 +08:00

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Alfreds Futterkiste	Maria Anders	Germany
Island Trading	Helen Bennett	UK
Magazzini Alimentari Riuniti	Giovanni Rovelli	Italy

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The mathematics powered by MathJax:

$$ \begin{equation} \sum_{n=1}^\infty 1/n^2 = \frac{\pi^2}{6} \label{eq:series} \end{equation}

We can reference the equation as \eqref{eq:series}.

When a \ne 0, there are two solutions to ax^2 + bx + c = 0 and they are

 x = {-b \pm \sqrt{b^2-4ac} \over 2a}

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The 2nd footnote source ↩︎

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