Apparently, this user prefers to keep an air of mystery about them.
13 What's the difference between saying that there is no cardinal between $\aleph_0$ and $\aleph_1$ as opposed to saying that… dec 5 '12
2 How can one prove that the union of two finite sets is again finite, without the use of arithmetic? aug 11 '12
2 There exists a finite set of natural numbers which isn't a proper subset of any other finite set of natural numbers? aug 11 '12
2 Connected spaces: is there a mistake in the example below from James Munkres' Topology? may 17 '14
0 Why is $\omega$ the smallest $\infty$? dec 4 '12