 8:41 AM
0  [integer-relation] only has two uses, and neither usage seems to use the tag properly. I suggest we remove this tag (I don't know the protocol for this, please let me know if this is not how one should do this). Likewise, [invariant-measure] has one use, and that too is a PSQ. 9:01 AM
The tag was created in June 2017. It is still without the tag-info (also I suggested to the tag creator that it might be useful to create one.)

2 hours later… 10:57 AM
The two question which have the tag are:
4  The number $10.3500574150076$ is a numeric approximation of $\log(2)^2+\pi^2$. It has a relatively simple form. But I have tried Maple's identify, ISC+, wolframalpha, and none of these could find a closed form of it. Is there anyway to find its closed form with algorithm/software? My impression ...

1  I would like to find the number of all points with integer coordinates ($(x,y,z): x,y$ and $z$ integer) in an ellipsioid $\frac{x^2}{a^2}+\frac{y^2}{b^2}+\frac{z^2}{c^2} < P$ Is it possible to find an equation for the number of them, and how? I encountered this problem while solving a physics...

Since was created only recently, it is not surprising that there is only one question. (In fact, it was after the last data dump - so the question is not even shown in SEDE.)
0  Could anyone tell me what does it mean by discrete, Lebesgue singular and absolutely continuous parts of an invariant measure? Also, by example, could anyone help me to understand, how a measure can be uniquely decomposed into two-measure? Thanks for helping!

2 hours later… 12:39 PM
According to usage, is for questions concerning groups defined via a presentation by generators and relations.
And is for questions about free groups and presentations of a group by generators and relations. My impression is that it would be better to have a separate tag for , since it is a separate area which is important enough. WP: Combinatorial group theory
@AlexanderGruber Maybe you could have something to say on the topic of the tag. (Considered that you have started a group-theory related room some time ago.) 12:59 PM
MO has separate tags for combinatorial-group-theory, free-groups and presentations-of-groups. (Also it has to be said that people on MO pay much less attention to tags then on this site.)

1 hour later… 2:02 PM
A new tag was created by Volterra. The same user also created a tag-excerpt.
1  The unknown functions $f_1(t)$ and $f_2(t)$ are the solutions of the following system of dual integral equations \begin{align} \int_0^\infty \mathrm{d}\lambda \, \lambda^{-\frac{1}{2}} J_{1}(\lambda r) \int_0^1 \mathrm{d}t \Big( \left( 1 + e^{-\lambda}(\lambda-1) \right) J_{\frac{3}{2}} (\lambda...

A new tag was created by miosaki.
0  Could anyone tell me how to show the (a) following line integral is of independent of the path? $$I= \int_C[(3y^2+\pi^3\cos x)i+(6xy-3\pi^3\sin y)j]\cdot dr$$, where $C$ is a curve connecting the point $P(-\frac{\pi}{2}, \pi)$ to $Q(\pi,\pi)$ (b) How to find a potential function and use that to...

1 hour later… 3:15 PM
@Andrews just a quick comment, I did not check how it is used, but I agree with @Martin that "Combinatorial Group Theory" is a name for a subject that is large and established enough to have a tag.

2 hours later… 5:13 PM
It came to me because one of my questions was added that tag, although I don't think it deserves that tag, so I looked for the usage. I thought "combinational group theory" means studying group theory via combinational approaches and techniques. The usage just made me confused somehow.