Search Results

I think we should make sure all questions and answers display correctly, even if old. [Edit: By this, I mean, necessary changes, that add clarity, should be welcome. Adding spaces, correcting trivia …

Please vote up if you agree that the requested undeleting is a reasonable (useful, beneficial) action for the community. Vote down otherwise.

They should stay, as they add to the collegiality of the site. Editing them off accomplishes little beyond depersonalizing posts and cluttering the front page.

One I like very much is Can we color $\mathbb Z^+$ with $n$ colors such that $a, 2a, \dots, na$ all have different colors for all $a$? Among the failed proposed attempts, the ones that appeared …

Simon Thomas asked in Ultrafilters and automorphisms of the complex field whether the existence of non-principal ultrafilters (over the natural numbers) suffices to imply the existence of a nont …

A question that fascinates me is the problem of characterizing the subsets $S$ of the unit circle $\mathbb T$ for which there is a power series with radius of convergence $1$ that, on $\mathbb T$, con …

This is motivated by this question, see also the comments, and Will Jagy's answer. I was asked to start a formal request, so here it is. A user that has expressed no desire to participate anymore on …

I should probably add that I find the topic of obvious mathematical interest, and the links and surrounding discussion useful. The gossip, not so much. …

Kenneth Kunen passed away yesterday, August 14. Kunen is best known for his work in set theory and set-theoretic topology. https://www.math.wisc.edu/node/829

In the old meta we had a very useful thread where one could point to moderators multiple accounts to be merged. Since things have changed, would there be a point on having such a thread here, or what …

There are quite a few questions on the main site related to (first-order) Peano Arithmetic and its fragments. Here are two examples: 1, 2 (but there are many others). It would be nice, and feels appr …

I did this once, here. I was going to answer the question, but Andy did it first. I still felt there was some value in the remarks I was going to add, but it felt strange to do it in a new answer, and …

A paper by T. Chartier, P.P. Pach and myself describing the status of "Can we color Z^+ with n colors such that a, 2a, …, na all have different colors for all a?" has just been published. Coloring the …

I have discussed MO but do not participate in the site do not seem concerned with these issues, luckily, but typically indicate that their field is underrepresented; there is the beginning of a good discussion …

Unlike what another answer suggests, I think that "continuum hypothesis" is not a good tag to use as a proxy here. Instead, I assume many of these questions would be about "cardinal characteristics" …