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I remember seeing the following interesting exchange recently on MathOverflow: someone asked a question about something, another person ($X$) answered (or commented) that the answer is such-or-such ...

I had already asked a question as follows: "Is there a one dimensional foliation of a two dimensional manifold whose foliation groupoid is diffeomorphic to a 3 sphere with two north pole. The ...

I vaguely recall that some years ago, there was an MO question about how to distinguish between the complex numbers $i$ and $-i$, and in what sense this might be meaningful. I also recall that I ...

I am seeking a link to a question I posed myself, but which I can no longer find, either with Google site:https://mathoverflow.net or with StackExchange search (...

I'm looking for a post that I'm 100% sure was still here on this site about a year ago. It probably has tags "big-list" and "soft-question", and at least several of the responses received more than ...