Mathematics
Noam D. Elkies's user avatar
Noam D. Elkies's user avatar
Noam D. Elkies's user avatar
Noam D. Elkies
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All Questions Answers
Score Newest
answer
75
Prove that if V is finite dimensional then V is even dimensional?
Jun 17, 2016
answer
74
Does $\sum _{n=1}^{\infty } \frac{\sin(\text{ln}(n))}{n}$ converge?
Jan 8, 2014
answer
52
A conjectural closed form for $\sum\limits_{n=0}^\infty\frac{n!\,(2n)!}{(3n+2)!}$
Oct 6, 2013
answer
37
Is there a way to write an infinite set that contains only irrational numbers without integer multiples?
Apr 24, 2016
answer
36
Simplest or nicest proof that $1+x \le e^x$
Sep 25, 2013
answer
34
Convex surface on which any two points $a,b$ can be joined by a curve of length $(\pi/2-\epsilon)|a-b|$
Aug 13, 2014
answer
33
Fibonacci $\equiv -1 \mod p^2$
Jul 22, 2015
answer
30
An exotic sequence
Mar 17, 2014
answer
29
Continuous generalization of $\sum_{k=0}^n {n \choose k} = 2^n$?
Jan 11, 2014
answer
26
Rational solutions to $a+b+c=abc=6$
Aug 13, 2015
Top network posts
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242
Should the formula for the inverse of a 2x2 matrix be obvious?
140
Source and context of $\frac{22}{7} - \pi = \int_0^1 (x-x^2)^4 dx/(1+x^2)$?
103
Tweetable Mathematics
91
Inverting lower triangular matrix in time $n^2$
85
Tweetable Mathematics

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