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

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145 Why do we not have to prove definitions? Aug 17 '15
79 Division by $0$ and its restrictions Dec 2 '17
76 not both $2^n-1,2^n+1$ can be prime. Jul 25 '13
57 Why are modular lattices important? Jul 15 '13
55 Doesn't the unprovability of the continuum hypothesis prove the continuum hypothesis? Sep 26 '17
52 What is limit superior and limit inferior? Jun 17 '13
51 Can proof by contradiction 'fail'? Mar 29 '16
40 If there are $74$ heads and $196$ legs, how many horses and humans are there? Apr 19 '16
40 Why isn't an infinite direct product of copies of $\Bbb Z$ a free module? Mar 4 '13
38 Can the difference of 2 undefined limits be defined? Nov 11 '17
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