Multiple labels for multiple aligned equations in one math environment

[sbiser]

Hey together,

I'm working on some code documentation which I need both as HTML as well as PDF. Is there any way to achieve the following graphical output not

only as PDF but as HTML as well?

For latex output I've used the following code:

.. math::

      :label: testpdf

      :nowrap:

      \begin{align}

         2x^2 + 3(x-1)(x-2)   & = 2x^2 + 3(x^2-3x+2) \\ \nonumber

                              & = 2x^2 + 3x^2 - 9x + 6 \\ 

                              & = 5x^2 - 9x + 6 

      \end{align}

But I couldn't manage to get the same rendering in HTML (either only one label number, or no at all...)

Thanks for any suggestions.

Stefan

[Matt from Documatt]

Hello Stefan,

I'm not good at typesetting math, but is your problem just that the numbers "(2.8)" and "(2.9)" on the right are not rendered in HTML? Or you can't render math in HTML at all?

For example, if I reuse your snippet in my project, it looks like this:

The only what I did differently in my conf.py was adding "'sphinx.ext.mathjax'" to "extensions" list.

Matt

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[Matthias Geier]

Hi Stefan.

AFAIK, this is not possible with Sphinx's :label: option, because this
always applies to the whole equation, even if it has multiple lines.

You might be able to split your multiple lines into separate "math"
directives, but I guess then it'll be hard to get the vertical
alignment right.

But if you are willing to use MathJax's labelling mechanism, it should
work like this:

.. math::

:nowrap:

\begin{align}
2x^2 + 3(x-1)(x-2) & = 2x^2 + 3(x^2-3x+2) \\ \nonumber
& = 2x^2 + 3x^2 - 9x + 6 \\
& = 5x^2 - 9x + 6

\label{testpdf}
\end{align}


In addition, you'll need to activate the MathJax labelling:

mathjax_config = {
'TeX': {'equationNumbers': {'autoNumber': 'AMS', 'useLabelIds': True}},
}

Also, the referencing with :eq: will not work anymore, instead you'll
have to use :math:`\ref{testpdf}`.

The big disadvantage of the whole thing is that MathJax references
only work within the same page.
And they don't take the section number into account. At least by
default, there might be a setting to fix this ...?

cheers,
Matthias

On Fri, Apr 24, 2020 at 4:50 PM sbiser <stefan....@gmail.com> wrote:
>