I know that I can use labels in an in-line equation, but since it is an in-line equation I didn’t want this equation to be numbered, instead I would like to reference it by an \star, and keep the hyperlink property, just like it is possible with \tag in the \begin{equation} .... \end{equation}, but \tag does not seem to work in the \begin{math} .... \end{math} that is an in-line equation environment.

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    hyperref comes with \hypertarget and \hyperlink: \documentclass{article} \usepackage{amsmath} \usepackage{hyperref} \usepackage{lipsum} \begin{document} bla bla bla (this is \hypertarget{Pythagoras}{$a^2+b^2=c^2$} \dots \lipsum[1-6] As evident from \hyperlink{Pytagoras}{Pytagoras' formula} \dots \end{document} – user121799 Apr 3 '19 at 4:17
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    @marmot Your second \hyperlink is one h short, or your first \hypertarget is too long by one h :) – user156344 Apr 3 '19 at 8:27
  • Although @marmot has given a recipe for doing this, I wonder how a reader is going to find the reference if the document isn't read online with a live linking capability. – barbara beeton Apr 3 '19 at 20:58
  • @barbarabeeton In the old-fashioned way, i.e. calling the relation Pythagoras' theorem and expecting the reader to know it. You can add it to the index, too. – user121799 Apr 3 '19 at 21:00

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