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Noam D. Elkies's user avatar
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Noam D. Elkies
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259
Should the formula for the inverse of a 2x2 matrix be obvious?
Feb 21, 2012
144
Source and context of $\frac{22}{7} - \pi = \int_0^1 (x-x^2)^4 dx/(1+x^2)$?
Jun 9, 2011
106
Tweetable Mathematics
Apr 27, 2017
92
Inverting lower triangular matrix in time $n^2$
Nov 23, 2020
86
Tweetable Mathematics
Apr 26, 2017
80
Does Zhang's theorem generalize to $3$ or more primes in an interval of fixed length?
Jun 4, 2013
71
How good is Kamenetsky's formula for the number of digits in n-factorial?
Aug 26, 2011
66
Absolute value inequality for complex numbers
May 21, 2014
66
There's something strange about $\sqrt{\big(j(\tau)-1728\big)d}$
Jan 16, 2014
65
$\mathbf{P} = \mathbf{NP}$, what's the problem?
Apr 12, 2022
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Why has the question "Optical methods for number theory?" been closed?
8
Interpretation of Time-limit for Editing Comments
6
Can a person other than the author start a bounty for a question they like?
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Prove that if V is finite dimensional then V is even dimensional?
76
Does $\sum _{n=1}^{\infty } \frac{\sin(\text{ln}(n))}{n}$ converge?
55
A conjectural closed form for $\sum\limits_{n=0}^\infty\frac{n!\,(2n)!}{(3n+2)!}$
39
Simplest or nicest proof that $1+x \le e^x$
38
Is there a way to write an infinite set that contains only irrational numbers without integer multiples?