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Martin Sleziak
Martin Sleziak
01:04
new-tag A new tag dense-sets was created.
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Q: Does there exist a dense subset $\ X\ $ of $\ \mathbb{R}\ $ and a real number $\ a\neq 0\ $ such that $\{\ x+a:\ x\in X\ \} =\mathbb{R}\setminus X\ ?$

Adam RubinsonDoes there exist a dense subset $\ X\ $ of $\ \mathbb{R},\ $ and a real number $\ a\neq 0\ $ such that $\ \{\ x+a:\ x\in X\ \} = \mathbb{R}\setminus X\ ?$ Clearly our set $\ X\ $ must be totally disconnected and uncountable on every interval in order for $\ X\ $ to exist. But I'm actually not sur...

real-analysis general-topology baire-category dense-sets
 
3 hours later…
Martin Sleziak
Martin Sleziak
04:06
deleted-tag The tag dense-sets is gone: math.stackexchange.com/posts/4227721/revisions
 
10 hours later…
Feeds
Feeds
13:54
0
A: Tag management 2021

SeraPhimProposal: Add the tags: hochschild-cohomology. There are tags for group, sheaf, De Rham, etale, galois, local and equivariant cohomology, but no tag for Hochschild cohomology despite there being a decent number of questions about it. Hochschild cohomology is also highly relevant in the deformati...

 
4 hours later…
Feeds
Feeds
17:56
0
Q: What is the etiquette of tag creation and editing?

SeraPhimIn this years Tag management thread, I've suggested the creation of the tags hochschild-cohomology and a-infinity-algebras. Let's say for the sake of argument that this suggestion is well received and not contested and that I go ahead and create them. I will be editing my own relevant questions t...

discussion tagging editing retagging
Xander Henderson
Xander Henderson
18:14
in CURED, 1 min ago, by Xander Henderson
I would love to have a conversation about the publishing tag---personally, I think that we should probably eliminate that tag. It doesn't really seem relevant to Math SE. Moreover, it is a relatively low-traffic tag (less than 150 questions have that tag).

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