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If I make bibliography, then I can make unique name for any position, for example by \bibitem{tutor}, then refer to it in the text with \cite{tutor}.

Now, let's say that I am writing some bigger text, usually using \begin{align} and \end{align} for adding mathematical formulas, so I can format them nicely and have them being automatically enumerated.

While I keep adding and changing things, numeration keeps changing, so something that was previously "Theorem (5.24)" becomes "Theorem (5.36)", etc. It's really problematic, as I have to keep changing it manually, which is inane and adds much of unnecessary work.

Can I make this more flexible, so later I don't have to go through every single reference that I wrote manually and change it to something else?

Maybe there's a way to possibly "label" certain align lines and refer to them later, using this unique label in similar way to how I can use \bibitem and \cite?

Kusavil
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    You should definitely familiarize yourself with LaTeX's \label and \ref macros; the former serves to set a "label" (usually associated with a counter such as equation or theorem), the latter serves to generate the cross-reference to an object that was labeled elsewhere in the document. Did you see the posting Cross-reference packages: which to use, which conflict? The answers discuss both the basic \label-\ref mechanism as well as various packages which make sophisticated cross-referencing quite straightforward and easy to use. – Mico Feb 18 '18 at 23:51
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    @Mico Thank you! I looked into your link, then knowing what to look for I also found the link below, and it looks like \label{eq:name_here} and \ref{name_here} works for me :-)
    https://en.wikibooks.org/wiki/LaTeX/Labels_and_Cross-referencing     – Kusavil Feb 19 '18 at 00:07
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    regarding documentation for align. the user guide for amsmath may be more reliable than the latex wikibook, which does not always document "best practices". specifically, \eqref{...} is recommended over \ref{...} for references to display math. – barbara beeton Feb 19 '18 at 02:40
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    it's also worth noting that the \label - \ref mechanism is also available for theorems. see the amsthm user guide for guidance on using that package. (other theorem packages provide equivalent facilities.) – barbara beeton Feb 19 '18 at 02:50
  • Note that your approach to bibliographies isn't the most efficient one, either. However, perhaps that's something better returned to later. – cfr Feb 19 '18 at 03:10

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