Mathematics
user43208
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45 Is there a nice proof that $123456789098765432111$ is prime? Sep 13 '13
34 What is $\gcd(0,0)$? Sep 16 '13
30 What is the opposite category of $Set$? Jan 31 '15
27 Under what conditions the quotient space of a manifold is a manifold? Sep 17 '13
18 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 '13
15 Can you equip every vector space with a Hilbert space structure? Jan 10 '15
14 Logically speaking, why can variables be substituted? Oct 19 '13
14 Proving it doesn't exist a homeomorphism between $\mathbb R$ and $\mathbb R^n$, $n>1$. Oct 11 '13
13 group of units in a topological ring Aug 11 '15
9 Algebraic numbers that cannot be expressed using integers and elementary functions Oct 14 '13
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