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Bart Michels

 Mathematics

Associated with Math.SE; for both general discussion & math qu...
7
Bart Michels
Aug 20, 2022 18:28
Some very active members quit/moved on and that started the feedback loop or something
Bart Michels
Aug 20, 2022 18:28
less answers -> less search engine results -> less traffic -> less questions -> less answers
I suppose
Bart Michels
Aug 20, 2022 18:26
That was about data from before covid
Bart Michels
Aug 20, 2022 18:26
This post has some speculative answers: meta.stackexchange.com/questions/336925
Bart Michels
Aug 20, 2022 18:25
:)
Bart Michels
Aug 20, 2022 18:24
12 years of Math.SE
Bart Michels
Aug 20, 2022 18:24
user image
Bart Michels
Aug 20, 2022 18:22
It's the data from site analytics
Bart Michels
Aug 20, 2022 18:22
I found this answer about it (but doesn't answer the question I asked here in chat) math.meta.stackexchange.com/a/34623/43288
Bart Michels
Aug 20, 2022 18:19
Is there a meta post about this?
Bart Michels
Aug 20, 2022 18:19
The number of answers and questions is about half that in the 2021-2022 academic year than it was in previous years. Why?
barto
Nov 9, 2017 15:29
I posted a community promotion ad for ProofWiki here: math.meta.stackexchange.com/a/27255/43288
barto
Oct 29, 2017 06:38
I posted a community promotion ad for ProofWiki: math.meta.stackexchange.com/a/27255/43288
barto
Oct 25, 2017 23:06
One can probably do it too by tinkering around with partitions and inelegant combinatorics
barto
Oct 25, 2017 23:06
@LeakyNun One shows that open sets form a vector space over F2
barto
Oct 25, 2017 23:04
@MatheiBoulomenos Or that a finite topological space in which every open set is closed, has $2^n$ open sets for some $n$
barto
Oct 25, 2017 22:53
ProofWiki community promotion ad uploaded! math.meta.stackexchange.com/a/27255/43288
barto
Oct 25, 2017 13:40
I posted an ad for ProofWiki: math.meta.stackexchange.com/a/27255/43288
 

 Discussion on question by Maths1729 :…

Imported from a comment discussion on math.stackexchange.com/q...
Bart Michels
Aug 2, 2021 19:49
At first glance, some parts of your proof are perfectly fine but are unnecessarily detailed. I think you should highlight the parts that you think are doubtful and omit the proofs of the statements that you are confident about; for example Lemma 1.1, which does not mention $\zeta$ at all. As it stands, it is very long and the readers here want to see directly the heart of the argument.
 

 Discussion on question by Dan: True o…

Imported from a comment discussion on math.stackexchange.com/q...
Bart Michels
Jul 10, 2021 13:44
@Dan you need to define what you mean by a closed form. Apparently you allow factorials and you don't allow $\sum$. What other functions do you allow?
 

 The Crusade of Answers

Our menace: the Unanswered queue. Our goal: total annihilation...
punctured dusk
Dec 17, 2019 15:17
@Brahadeesh thanks!
punctured dusk
Dec 17, 2019 12:41
another one: math.stackexchange.com/questions/874978
punctured dusk
Aug 2, 2019 13:55
2
Q: When is a smooth homeomorphism a diffeomorphism?

user194469I would like to know when a smooth homeomorphism is actually a diffeomorphism. I know that if $f$ is a homeomorphism and an immersion (i.e. an embbeding), then $f$ is a diffeomorphism. However, I do not want to use the notions of immersion, submersion,... I read somewhere that in low dimensions ...

general-topology differential-geometry differential-topology
nbarto
Feb 22, 2019 15:02
another: math.stackexchange.com/questions/684632/…
nbarto
Feb 19, 2019 08:50
Here's another one: math.stackexchange.com/questions/1543369
barto
Aug 20, 2018 13:41
here is an answer:) math.stackexchange.com/questions/1211231
barto
Mar 9, 2018 21:55
fwiw: math.stackexchange.com/questions/1191206
barto
Oct 25, 2017 13:02
oh, I've been here before, but it's been some time. I confess I merely visited because my answer to that question went unnoticed, and I knew only one place to beg for votes :)
barto
Oct 24, 2017 18:32
another relatively old question answered: math.stackexchange.com/questions/2361979
 

 Discussion on question by user697626:…

Imported from a comment discussion on math.stackexchange.com/q...
punctured dusk
Sep 9, 2019 16:22
If I understand correctly, you are deducing that the integral converges at some point $s$ from the fact that the sum converges at $s$? I can't follow that part very well.
 

 CURED

For feedback/discussion/requests of Close/Undelete/Reopen/Edit...
3
rabota
Apr 1, 2019 07:59
math.stackexchange.com/questions/3170298 same question asked twice by the same user
nbarto
Feb 16, 2019 21:12
This was mistakenly closed as a duplicate: math.stackexchange.com/questions/3115386/…
 

 Tagging

When should a tag be added
1
nbarto
Feb 23, 2019 20:32
In the end, has action (1) of math.meta.stackexchange.com/questions/25655/… been put into effect?
barto
Aug 20, 2018 19:56
@MartinSleziak Automorphic works for me, I don't feel strongly about the tag.
barto
May 14, 2018 17:17
I added symmetric-algebra, it is simimar to the existing exterior-algebra
barto
May 14, 2018 08:42
Random possibilities: manifolds-with-many-symmetries, symmetries-on-manifolds (a symmetric space is homogeneous but a locally symmetric space need not be)
barto
May 14, 2018 08:40
@JohnMa I'm not sure if symmetric-spaces is useful either. Merging them into something is not a bad idea.
barto
May 14, 2018 06:31
@MartinSleziak Done. I wrote something for the excerpt.
barto
Feb 11, 2018 17:49
16
Q: Which (if any) inequalities with real numbers should have separate tags?

Martin SleziakThere are certainly many inequalities which are rather important and useful and which appear frequently in various areas in mathematics (AM-GM, Jensen, Cauchy-Schwarz, etc.) The question I want to ask is whether some of them would be also useful as tags on this site. And if yes, for which of them...

discussion tagging
barto
Feb 11, 2018 17:48
Tags like these probably have been discussed somewhere
barto
Feb 11, 2018 17:44
There is a list of tag synonym suggestions to merge tags for specific inequalities to the main inequality tag: math.stackexchange.com/tags/synonyms
barto
Oct 30, 2017 21:36
integration-by-parts -> integration synonym approved
 

 TeX, LaTeX and Friends

\begin{chat}
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8
barto
Jul 29, 2018 18:39
ah nvm got it ><
barto
Jul 29, 2018 18:33
could it be that there has recently been an update for Biblatex or biber? I'm not getting a bibliography since today..
 

 Category Theory

discuss abstract nonsense. draw and share diagrams with tikzcd...
barto
Dec 29, 2017 13:05
Yup, Mac Lane uses it as well
barto
Dec 29, 2017 13:02
@Narcissusjewel I mean the $h_{-}$ and $h^{-}$. But I've seen "Yoneda functor" a few times, so I went for that.
barto
Dec 28, 2017 11:33
Yes that'll do
barto
Dec 28, 2017 11:32
Oh, or just "Yoneda embedding (functor)"
barto
Dec 28, 2017 11:25
On the wikipedia page of Yoneda's Lemma (and other sources), there are these $h^A$ and $h_A$ that are not the hom functors but the functors that send objects to hom functors. Do they have a name? H-functors?
 

 2017 Mathematics Moderator Election C…

This is a place to ask questions of potential candidates, or t...
barto
Oct 17, 2017 20:01
25 seconds, you're getting better at this :)