How do I number equations only if they are referred to in the text?
While I am writing a document, I like to use
align rather than
label them for all equations that I write in case I need to refer to them later in the document. I end up not referencing some of the equations I have
labeled. I was wondering if there is an easy way to strip equation numbers for equations that are not called using
eqref anywhere in the document?
I can imagine this can be a difficult task where LaTeX will have to keep a list of
labels and a list of
eqrefs and then unless the document is changed between compilations, "un-number" the ones in its list of
labels that are not found in the list of
Well, worth asking anyway! :)