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Martin Sleziak
Martin Sleziak
08:16
new-tag Two new tags simple-modules and r.
The tag simple-modules has a tag-excerpt and a tag-wiki.
Isn't there already a tag for R (programming language)? Was such tag discussed in the past?
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Q: Why is a simple submodule ${}_{kG}S \leq {}_{kG}kG$ with $_{kG}S \simeq\ _{kG}k$ necessarily $k \cdot \bigl( \sum_{g \in G} g \bigr)$?

Liang ChenLet $G$ be a finite group, $k$ a field, and $kG$ the corresponding group algebra. My question is: When ${}_{kG}S$ is a simple submodule of the left regular module ${}_{kG}kG$ with $\dim_k(S) = 1$ and $$_{kG}S \simeq\ _{kG}k$$ where the module structure of $k$ over $kG$ given by $g\cdot x:= x$ fo...

finite-groups representation-theory simple-modules
0
Q: Where's my error in the calculation of the CDF of the product of two random variables?

GPerez I have an event that I'd like to model as the product of a random variable $X \sim \text{Poisson}(\lambda)$ and $Y\sim\text{Gamma}(\alpha,\beta)$. I'd like to see the quantiles of my theoretical model, for which I'll need the inverse CDF. Let's focus on just the CDF because once I have that I wi...

probability statistics probability-distributions simulation r
Simple module
In mathematics, specifically in ring theory, the simple modules over a ring R are the (left or right) modules over R that are non-zero and have no non-zero proper submodules. Equivalently, a module M is simple if and only if every cyclic submodule generated by a non-zero element of M equals M. Simple modules form building blocks for the modules of finite length, and they are analogous to the simple groups in group theory. In this article, all modules will be assumed to be right unital modules over a ring R. == Examples == Z-modules are the same as abelian groups, so a simple Z-module is...
R (programming language)
R is a programming language for statistical computing and data visualization. It has been adopted in the fields of data mining, bioinformatics, and data analysis. The core R language is augmented by a large number of extension packages, containing reusable code, documentation, and sample data. R software is open-source and free software. It is licensed by the GNU Project and available under the GNU General Public License. It is written primarily in C, Fortran, and R itself. Precompiled executables are provided for various operating systems. As an interpreted language, R has a native command line...
Welcome! It's nice that this room isn't completely lonely place.
 
5 hours later…
Martin Sleziak
Martin Sleziak
13:22
The tag called r was created before:
Dec 20, 2020 at 12:12, by Martin Sleziak
new-tag As pointed out above, a new tag r was created.
Dec 20, 2020 at 12:12, by Martin Sleziak
2
Q: Simulating Brownian motion in R. Is this correct?

ParsevalI have a Weiner process $\{W(t)\}_{t\ge0}$ with $\sigma^2=\text{Var}(W(1))=1$. For a real constant $\epsilon>0$ consider the differential ratio process $\Delta_\epsilon=\{\Delta_\epsilon(t)\}_{r>0}$ given by \begin{equation} \Delta_\epsilon(t) = \frac{W(t+\epsilon)-W(t)}{\epsilon}, \quad \text{fo...

statistics stochastic-processes brownian-motion r
Questions where the tag r was added/removed (including the editors): data.stackexchange.com/math/query/1105163/… data.stackexchange.com/math/query/1038474/…
Most frequent taggers/removers for r: data.stackexchange.com/math/query/1146497/… data.stackexchange.com/math/query/1038477/…
The SEDE query also returns this: Group representations over p-adic vector spaces. The tag r was indeed used there - but probably by mistake: math.stackexchange.com/posts/16510/revisions
Martin Sleziak
Martin Sleziak
14:10
No deleted questions tagged r: data.stackexchange.com/math/query/883845/…
Martin Sleziak
Martin Sleziak
14:36
@GPerez I brought up the new ta on meta: Should there be a separate tag for the programming language R? What should the tag be called? — Martin Sleziak 10 secs ago
Martin Sleziak
Martin Sleziak
14:49
Not an answer, really, but I'm not sure that we need such a tag. Most R-related questions are probably a better fit for Cross Validated, so I'm not really sure that we need it here. That said, I would suggest r-programming-language if the tag is going to exist here (to avoid misuse---r is likely to be confusing to non-R-users). — Xander Henderson ♦ 11 mins ago
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Q: Should there be a separate tag for the programming language R? What should the tag be called?

Martin SleziakAs the title suggests, this is about two questions: Should there be a separate tag for the programming language R? If such tag should exist on Mathematics, what should be the name. It is outside of my area, but R certainly seems to be popular among people interested in statistics. Should this s...

discussion tagging
 
2 hours later…
Martin Sleziak
Martin Sleziak
16:30
Some comments to: Editing Tags on Calculus Questions
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Q: Editing Tags on Calculus Questions

Math GuyWhenever I'm browsing questions about calculus(indefinite integration, definite integration and ODEs), more often than not I've seen only 1-2 tags being used, especially in old questions(6-10 years old). For example, Usually, calculus questions don't include the calculus tag(ironically). In inde...

support tagging editing
I don't see the point of adding, say, the "calculus" tag to a question that already has, say, the "integration" tag. Also, I think you should stop going on tagging sprees, where you retag a large number of (old) questions in a short span of time, thereby forcing newer questions off the front page. Please limit yourself to three or four retags (and other edits) a day. — Gerry Myerson yesterday
Also, maybe have a look at some of the questions listed under Related on this page. — Gerry Myerson yesterday
Proper categorization is great. But front page real estate is also great. Using similar limits as for questions is a good idea - no more than 6 per day. — davidlowryduda ♦ yesterday
See also: How much bumping is too much? Personally, I use saves for this purpose. One of my lists is called "Retag" - I add there questions where I think tags should be changed. (And sometimes I also include a note - so that I won't forget what I wanted to change.) In this way I can get to list later and retag only at a few question at the time. — Martin Sleziak 4 mins ago
 
3 hours later…
Martin Sleziak
Martin Sleziak
19:45
Hi it's me I asked one of those questions. I actually agree it makes more sense at Cross Validated, I just overlooked that forum's existence and posted here by inertia. Though I would say about the tag that if there's a matlab tag then it makes sense to have an R tag. — GPerez 3 hours ago

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