# Enlarging the scope of the epsilon-delta tag

The tag is used for questions about limits and continuity which use the $$\varepsilon$$-$$\delta$$ definition of such concepts. However, it is sometimes also used for a slightly different subject, namely the $$\varepsilon$$-$$N$$ definition of limit of a sequence, as it happened with this question. In my opinion, this is a reasonable option and I propose that the information concerning that tag asserts that it can be used for that purpose. I would like to know what the other members of this community think about that.

• My impression is that the tag is often used in this way, for example, you can have a look at the questions tagged epsilon-delta+sequences-and-series. – Martin Sleziak Apr 19 '20 at 12:11
• Sounds fine, go ahead and edit it into the tag if you like. – Alexander Gruber Apr 19 '20 at 17:21
• @AlexanderGruber It's done now. Thank you. – José Carlos Santos Apr 19 '20 at 17:35
• I had a teacher who used the term "epsilonics" to cover all such situations. Sadly I don't think it is well enough known for us to use it as a tag in place of "$\epsilon$ - $\delta$", but I wish it were. – JonathanZ supports MonicaC Apr 21 '20 at 3:04
• @JonathanZsupportsMonicaC I fully agree that it would be a great name for the tag if it was more well-known. – José Carlos Santos Apr 21 '20 at 6:24
• How about "limit-definition"? Obviously we would have to keep epsilon-delta as a synonym. – user771918 Apr 24 '20 at 9:23
• @user771918 That's a nice suggestion. I suggest that you post it here. – José Carlos Santos Apr 24 '20 at 9:27
• @JoséCarlosSantos Thanks, but I haven't signed up, and can't post in meta. Maybe you could do it? – user771918 Apr 24 '20 at 9:33

I think this is a great extension of the tag. I also would like to say that if the description of the tag has been edited to encompass “limits . . . of sequences,” then the tag itself should reflect this. I propose it be changed to epsilon-delta/epsilon-N or something similar. This would also encourage people to use the tag for sequences more. For example, I just asked a question to which this new tag is highly relevant.