2:21 AM
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It 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…
5:08 AM
deleted-tag The tag small-uncoutable-cardinals 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.)
There are several questions where this tag should be added, such as: Short proof of $\frak p=t$, Brief history of Cardinal Characteristics of the Continuum and Consistency Results Separating Three Cardinal Characteristics Simultaneously.
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
18 hours later…
11:44 PM
specific-question Here is another question with a deprecated tag: Positivity of linearization coefficients for binomial Sheffer polynomials.
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