I have a question that´s been put "on hold". And I have some questions. Who can see that this question is "on hold"? Can that see all users of the site or even some people who browse this site "from the outside", that, is even people who are not registered users of the site? Who can see ...

There is a story about Gauss being "unimpressed by FLT, pointing out (after finding a proof of the n=3 case) that in number theory it’s very easy to come up with problems that are very hard.". But, it is known that there were many developments in number theory since the time of Gauss, and some o...

I am often interested in bijections, defined over $\mathbb R^n$, and in discontinuous functions, also defined over $\mathbb R^n$. But, I did not find a tag "discontinuous functions" or a tag "bijections". I think that there is a tag "bijective combinatorics" but, if some of questions that I wan...