« first day (1669 days earlier)      last day (986 days later) » 

6:36 AM
Q: A finite non commutative ring of a specific cardinal

E. JosephAll rings are supposed to have a unit element $1$ here. Let $N\subset \mathbb N_{\geqslant 2}$ be the set such that $n\in N $ if, and only if, there does not exist a non commutative ring of cardinal $n$. For instance, $16\notin N$ because $A=M_2(\mathbb F_2)$ is a non commutative ring and $\ver...

Q: Tautological bundle of $\mathbb{P}^1(\mathbb{C})$

Vincenzo ZaccaroGuys I have this problem: Is it true that the tautological bundle on $\mathbb{P}^1(\mathbb{C})$ given by $L(-1)=\lbrace (\ell,z)\in\mathbb{P}^1\times \mathbb{C}^2 \: : \: z\in \ell \rbrace $ is a subbundle of $L(0)^2$, where $L(0)\cong \mathbb{P}^1\times \mathbb{C}$ ?

The tag creator also created tag-excerpt for line-bundles.
1 hour later…
7:46 AM
Only now I noticed that tag also has tag-excerpt.
I am in favor of getting rid of this tag. Looks like a case of useless badge-hunting to me. — Jyrki Lahtonen ♦ 35 mins ago
@JyrkiLahtonen I guess score +4 is sufficient to consider it a consensus. (We do not get a lot of votes on tag-related issues.) Will the tag be removed by mods (assuming you and other mods agree that it should be removed), or should it be removed manually? — Martin Sleziak 15 mins ago
@MartinSleziak I started removing it manually, but if I figure out /recall how to remove it with a single strike I will :-) — Jyrki Lahtonen ♦ 5 mins ago
Currently has 67 question.
@JyrkiLahtonen I can only write what I recall other mods mentioned. It seems that merging two tags effectively removes the tag. But this is probably not an ideal option here.
So I guess there's no way to do this without involving a dev. (Well, other than merging, which is no good here.)
Perhaps some more experienced user knows more about this?
@JyrkiLahtonen I guess that other than merging with another tag - which is probably not good for this tag - mods probably can't do it. Anyway, since this is unrelated to this specific tag, we can move the discussion to chat. (Although I am not sure there is much to be added.) — Martin Sleziak 5 secs ago
Anyway, I will start with the ones which are not tagged geometry. Just in case that merging could be a reasonable solution at least for some of them. (If all remaining questions with this tag are also tagged geometry, maybe they can be retagged without boumping..)
Re: case of useless badge-hunting. Seeing that several from the most active editors have been temporarily suspended, I should probably be more careful with my edits, too.
2 hours later…
10:26 AM
Would there be some suitable tags to add to this question. What about ? And ?
Q: Dropping parallel postulate and infinitude of straight line

MadhuI was reading an article about back ground of Killing's work by Thomas Hawkins from Historia mathematica $1980$ (doi: 10.1016/0315-0860(80)90027-0). It was written that Killing stated that if one drop assumptions infinitude of straight line and parallel postulates four possibilities arise, which ...

7 hours later…
4:56 PM
@MartinSleziak I have added tag-wiki - I admit that it contains almost nothing, but in the tag-wiki I have at least possibility to add Wikipedia link - links are not possible in tag-excerpt.

« first day (1669 days earlier)      last day (986 days later) »