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Top Questions
21
votes
Examples of mathematicians who lost interest in Math and got interested again?
math-history
mathematicians
asked May 29 '12 at 20:02
math.stackexchange.com
6
votes
Covering $\mathbb{R}^n$ by countably many lower dimensional pieces?
differential-geometry
asked Oct 14 '12 at 19:08
math.stackexchange.com
5
votes
Analytically continue a function with Euler product
complex-analysis
number-theory
analytic-number-theory
asked Apr 27 at 5:17
math.stackexchange.com
Top Answers
11
When is $(p - 1)! + 1$ a power of $p$?
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10
Find three polynomials whose squares sum up to $x^4 + y^4 + x^2 + y^2$
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10
Prove that for any $x \in \mathbb N$ such that $x<n!$ is the sum of at most $n$ distinct divisors of $n!$
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8
Given $a+b+c=0$, simplify the following.
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7
Irreducible Representations
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7
Can you provide me historical examples of pure mathematics becoming “useful”?
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6
Basic trace inequality
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6
Prove that $\frac{a^2}{a+b}+\frac{b^2}{b+c}+\frac{c^2}{c+a}\geq\frac{1}{2}(a+b+c)$ for positive $a,b,c$
math.stackexchange.com
6
Let $a_{i} \in\mathbb{R}$ ($i=1,2,\dots,n$), and $f(x)=\sum_{i=0}^{n}a_{i}x^i$ such that if $|x|\leqslant 1$, then $|f(x)|\leqslant 1$. Prove that:
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6
Exterior Algebra as quotient
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6
Prove that $ \left(1+\frac a b \right) \left(1+\frac b c \right)\left(1+\frac c a \right) \geq 2\left(1+ \frac{a+b+c}{\sqrt[3]{abc}}\right)$.
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5
Ask for hint of an inequality
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5
$\dfrac{(b+c-a)^2}{(b+c)^2+a^2}+ \frac{(c+a-b)^2}{(c+a)^2+b^2}+ \frac{(a+b-c)^2}{(a+b)^2+c^2} \ge \frac{3}{5}$
math.stackexchange.com
5
Hartshorne Lemma I.6.5; Why is $\mathfrak{m}_R\cap B\neq 0$?
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5
Tangent Space Exercise
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5
A question about prime ideals
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