Tagging - 2013-10-22

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7:17 AM

Some time ago I noticed that someone had created cardinality, which I find redundant considering the fact that it's usually just elementary-set-theory, and that it is almost never tagged as such. Do we really want to save that tag, or can we please please make it a synonym of elementary-set-theo...

I have retagged Prove that if A is a subset of B, then cardinality of A is less than or equal to B's cardinality? with elementary-set-theory.

I have removed cardinality from Suppose that $G$ is a finite cyclic group. Let $m=|G|$. Assume that $m\ge3$. Let $S=\{a\in G:|a|=m\}$. Prove that the cardinality of $S$ is even..

So the question currently having cardinality tag are the questions I have mentioned before.

And these two additional questions: 530292, 530726.

Thanks to Asaf for making a meta thread about this. Hopefully, this will help to tag those questions correctly.

Martin Sleziak

7:33 AM

I have also retagged Calculate the cardinalities of $A\times D$, where $D$ is an infinite set? as elementary-set-theory.

10 questions are left tagged cardinality at this moment. I'll stop my retagging for a while; so that I do not bump too many questions at the same time.

1 hour later…

Martin Sleziak

8:35 AM

Asaf has taken care of How can I quantify over the class of all cardinalities?

I have changed $K$ and $gKg^{-1}$ have the same cardinality to group-theory.

I have removed cardinality from How do I determine cardinalities, given the cardinality of other sets?. (This question is about finite sets, so I don't think the tag cardinals is suitable there.)

Down to 7.

Martin Sleziak

9:15 AM

Removed (cardinality) from Find the parity of the cardinality of a set

3 hours later…

Martin Sleziak

11:54 AM

$(X,<)$ is an uncountable set whose sections are countable, $f:X\to X,f(x)<x$,then $\exists x,f^{-1}(x)$ uncountable.; changed (cardinality) to (cardinals)

cardinality of the set of all dense subsets of $\Bbb R$; changed (cardinality) to (cardinals)

$L$ is a class of languages that cannot be represented by a regular expression. How to state cardinality of $L$.; changed (cardinality) to (cardinals)

3 questions remaining

2 hours later…