How to reference an in-line equation?

[dcul...@gmail.com]

I'm trying to reference an in-line equation by a method similar to that for a display equation. Code example --

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<p>Inline equation \( f(x) = x^2 \label{eq:z123a} \). More text ... </p>

<p>Attempt to reference inline equation \eqref{eq:z123a}.</p>

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However, \eqref{eq:z123a} simply displays as (???) so it appears that MathJax thinks that eq:z123a is undefined.

Can this be done? If not by the above method then are there any work-arounds?

Thanks,

Don C.

[Davide P. Cervone]

Labels and references can only be used with expressions that have tags or equation numbers.  That means you either have auto-numbering enabled, or use \tag explicitly.  If you use \label without a \tag or auto-produced equation number, there is nothing or the label to refer to.  So \ref can only be used to link to a displayed equation, not an in-line one.

If you want to link to an inline equation, you could add an anchor around an expression, and then use a standard <a> tag to link to it.  But it would not be clear what to use as the text of the link.  E.g.,

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<p>Inline equation <a name="eq-z123a">\( f(x) = x^2 \)</a>. More text ... </p>

<p>Attempt to reference inline equation via a <a href="#eq-z123a">link</a>.</p>

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Note that the use of colons in such link ID's is a bad idea, so I've swapped it for a dash.

Alternatively, you could add an ID within the expression using \cssId, e.g.,

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<p>Inline equation \( \cssId{eq-z123a}{f(x) = x^2} \)</a>. More text ... </p>

<p>Attempt to reference inline equation via a <a href="#eq-z123a">link</a>.</p>

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Davide

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[dcul...@gmail.com]

You mentioned that a colon should not be used in a link (e.g., "eq:z123a"). Why is this? (I only started using a colon for MathJax because I found that it was used elsewhere for MathJax -- for instance in the documentation -- http://mathjax.readthedocs.org/en/latest/tex.html?highlight=eqref). Or does this apply only for standard <a> links rather than MathJax links?