Mathematics
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user43208
  • Member for 10 years, 11 months
  • Last seen this week
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129
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29
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23
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Top posts
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All Questions Answers
Score Newest
question
47
Is there a nice proof that $123456789098765432111$ is prime?
Sep 13, 2013
answer
40
What is the opposite category of $Set$?
Jan 31, 2015
answer
39
Under what conditions the quotient space of a manifold is a manifold?
Sep 17, 2013
answer
36
What is $\gcd(0,0)$?
Sep 16, 2013
answer
19
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
answer
14
Proving it doesn't exist a homeomorphism between $\mathbb R$ and $\mathbb R^n$, $n>1$.
Oct 11, 2013
answer
14
Logically speaking, why can variables be substituted?
Oct 19, 2013
question
13
group of units in a topological ring
Aug 11, 2015
answer
9
Nilpotent elements in power series over a Noetherian ring
Oct 14, 2013
Top network posts
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144
Why is differentiating mechanics and integration art?
83
"Mathematics talk" for five year olds
62
Why do categorical foundationalists want to escape set theory?
62
Duality between compactness and Hausdorffness
56
Do these properties characterize differentiation?

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