Mathematics
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Apparently, this user prefers to keep an air of mystery about them.

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59 Why is the number of ways of choosing $0$ items from $n$ items $1$? Oct 22 '18
31 “Naturally occurring” non-Hausdorff spaces? Aug 3 '20
13 A basic inequality: $a-b\leq |a|+|b|$ Apr 14 '16
11 Is a function necessarily measurable, given that all of its level sets are measurable? Dec 28 '15
8 Questions about the definition of a Category Feb 3 '18
6 Fixed point combinator (Y) and fixed point equation Jan 4 '16
6 Is there a way to phrase “continuous” in terms of “connected”? Jun 1 '18
4 What's the point of an inclusion function defined $\to X$? May 2 '16
4 Is diameter of a set a measure? Jul 13 '16
3 Prove that $\sin^4n/\sqrt n$ is monotonically decreasing Dec 31 '15
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