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Mathematics
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user43208
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question
47
Is there a nice proof that $123456789098765432111$ is prime?
Sep 13, 2013
answer
41
What is the opposite category of $Set$?
Jan 31, 2015
answer
40
What is $\gcd(0,0)$?
Sep 16, 2013
answer
40
Under what conditions the quotient space of a manifold is a manifold?
Sep 17, 2013
answer
20
For any given set of 13 distinct real numbers, prove we can always find two numbers $x$ and $y$ that $0<\frac{x-y}{1+xy}\leq 2-\sqrt{3}$.
Oct 18, 2013
answer
16
Can you equip every vector space with a Hilbert space structure?
Jan 10, 2015
question
15
group of units in a topological ring
Aug 11, 2015
answer
14
Logically speaking, why can variables be substituted?
Oct 19, 2013
answer
14
Proving it doesn't exist a homeomorphism between $\mathbb R$ and $\mathbb R^n$, $n>1$.
Oct 11, 2013
answer
10
group of units in a topological ring
Aug 22, 2015
Top network posts
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145
Why is differentiating mechanics and integration art?
118
What's a mathematician to do?
85
"Mathematics talk" for five year olds
64
Duality between compactness and Hausdorffness
63
Why do categorical foundationalists want to escape set theory?