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02:21
Which tags should be used for: Division of space by hyper-planes?
3
Q: Division of space by hyper-planes

Aaron MeyerowitzIt is a well known and lovely result that the maximum number of regions that $\mathbb R^{k}$ (with $k$ positive) can be divided into by $n$ hyperplanes is given by $$1+n+\binom{n}{2}+\cdots+\binom{n}{k}. $$ and occurs when they are in general position. It is clear that the minimum with distinct ...

I will just remind that the tag (geometry) is deprecated on MO (see the tag-info). I'll leave the choice of tags to more experienced users - I am not exactly sure which of the geometry-related tags to use here. — Martin Sleziak 38 secs ago
 
3 hours later…
05:08
The tag is now gone. (As I've mentioned, mods could have done this without bumping. But the fact that it was done manually has an advantage, too - it's possible to find in SEDE the question which had this tag at some point.)
I will add the tag to those questions later.
There are also a few other questions where I am less sure - so I'll leave retagging to others. For example: Hausdorff gaps and $\mathfrak{p}=\mathfrak{t}$, The dominating number $\mathfrak{d}$ and convergent sequences or Is the Martin's axiom number $\mathfrak m$ regular.
The tag (small-uncountable-cardinals) is now gone - I have replaced it by (cardinal-characteristics) in all remaining questions: chat.stackexchange.com/rooms/10243/conversation/…Martin Sleziak 1 min ago
@MartinSleziak The tag was removed by Andrés E. Caicedo.
 
18 hours later…
23:44
0
Q: Positivity of linearization coefficients for binomial Sheffer polynomials

Tom CopelandGiven the formal ordinary generating function (o.g.f.), or power series, $$ f^{(-1)}(x) = x - [c_2x^2 + c_3x^3 +c_4 x^4 + \cdots],$$ construct the binomial Sheffer polynomial sequence $p_n(t)$ from the exponential generating function $$ e^{f^{(-1)}(x) \cdot t} = e^{x \cdot p.(t)},$$ where $$...


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