In a paper that I am working on, the numbering of equations in the proofs has gotten pretty large, even with my removing a bunch of numbering of equations that I do not reference back to in later parts of the paper.
The numbering is in the twenties now, e.g., $(19)$, $(20)$, ...
and I usually reference back to them like this,
"...then $(19)$ and $(20)$ imply that ...."
Is there another way I could number my equations instead? I don't want to reach equation $(100)$ ... that seems like not a good idea.
My question is:
Could I instead just number my equations per theorem statement - proof? So that for a new theorem and its proof, I could restart the numbering ... back to $(1)$, $(2)$, ... $(5)$ ...
I am saving Roman numerals ($i$, $ii$, $iii$, $iv$) for necessary conditions in the theorem statements and don't plan to use them in the proofs.
Thanks,
If you are about to have 100-ish equations, you are likely to partition your text into several chapters. Restarting the equation counter per chapter is probably preferable (and easily done). If you are using $\LaTeX$ (which you probably should anyway), you can even automatically turn a reference "(5)" into "chapter 3, (5)" or similar in case you need to reference a far away equation now and then. For details on the latter, you may want to ask follow-up questions on tex.SE.