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8:41 AM
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Q: Proposal to delete tag [tag:integer-relation] and [tag:invariant-measure]

Don Thousand[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:
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Q: How to find the closed form of 10.3500574150076 with software/algorithm?

ablmfThe 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
Q: Integer points in a parametric ellipsioid

NeinsteinI 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.)
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Q: discrete, Lebesgue singular and absolutely continuous parts of an invariant measure

MarsoCould 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
But it would be better to hear from somebody who knows more about this topic.
@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.
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Q: Solving a system of two dual integral equations for the unknowns $f_1(t)$ and $f_2(t)$ either analytically or numerically

VolterraThe 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.
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Q: potential function, line integral path indipendence, parametrization

miosakiCould 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.
 

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