We can define a very simple cardinal characteristic in the following way. Recall the relation $\leq^*$ on $\omega^\omega$ defined by $x\leq^* y$ iff $x(i)\leq y(i)$ for all but finitely many $i$. For $x,y\in\omega^\omega$, say that $x$ and $y$ are comparable, denoted by $x\parallel y$, if either ...
This question has generated a lot of discussion while I was looking away! Here are my thoughts. The primary purpose of tags is to aid with search. As mathematicians, we have a tendency to think in terms of classification and taxonomy instead, but this is not the best way to think of tags and we ...
What about creating small-uncountable-cardinals tag? (The tag name is within the recently increased 35 character limit.) Looking at the main site, it seems that small uncountable cardinals (such as $\mathfrak p$, $\mathfrak t$, $\mathfrak b$, $\mathfrak d$, etc.) get quite a lot of attention on ...
It seems that these three tags are being discussed in this thread: infinite-combinatorics, small-uncountable-cardinals, cardinal-characteristics.The tag infinite-combinatorics exists for a long time, but it might be good to improve the tag-info. Whether or not the other two tags should be created...
« first day (2142 days earlier) ← previous day next day → last day (1956 days later) »