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Mathematics
Andreas Blass's user avatar
Andreas Blass's user avatar
Andreas Blass's user avatar
Andreas Blass
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150
Why do we not have to prove definitions?
Aug 17, 2015
81
not both $2^n-1,2^n+1$ can be prime.
Jul 25, 2013
79
Division by $0$ and its restrictions
Dec 2, 2017
70
Why are modular lattices important?
Jul 15, 2013
57
Doesn't the unprovability of the continuum hypothesis prove the continuum hypothesis?
Sep 26, 2017
56
What is limit superior and limit inferior?
Jun 17, 2013
52
Can proof by contradiction 'fail'?
Mar 29, 2016
49
What are disasters with Axiom of Determinacy?
Feb 15, 2015
46
If there are $74$ heads and $196$ legs, how many horses and humans are there?
Apr 19, 2016
45
Why isn't an infinite direct product of copies of $\Bbb Z$ a free module?
Mar 4, 2013
Top Meta posts
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27
Is downvoting all solutions to a question that turns out to be a duplicate an acceptable use of downvotes?
5
How to deal with quantifier abuse?
5
I've put a large bounty to get the attention or to get a good answer, I got neither.
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251
What are some examples of colorful language in serious mathematics papers?
176
Set theories without "junk" theorems?
102
Mathematical "urban legends"
91
Is it "vita" or "vitae"? Why?
83
Why are many obviously pointless papers published, or worse studied?