close
The Wayback Machine - https://web.archive.org/web/20200725213831/https://stackexchange.com/users/844828/noam-d-elkies

Stack Exchange

Noam D. Elkies

Harvard University, Cambridge, MA 02138

http://math.harvard.edu/~elkies

[Not sure yet what to use this space for...]
top accounts reputation activity bookmarks subscriptions
Top Questions
Top Answers
205
Should the formula for the inverse of a 2x2 matrix be obvious?
mathoverflow.net

79
Tweetable Mathematics
mathoverflow.net

76
Tweetable Mathematics
mathoverflow.net

74
Does $\sum _{n=1}^{\infty } \frac{\sin(\text{ln}(n))}{n}$ converge?
math.stackexchange.com

69
Prove that if V is finite dimensional then V is even dimensional?
math.stackexchange.com

67
How good is Kamenetsky's formula for the number of digits in n-factorial?
mathoverflow.net

61
There's something strange about $\sqrt{\big(j(\tau)-1728\big)d}$
mathoverflow.net

58
Absolute value inequality for complex numbers
mathoverflow.net

58
Parity of $\lfloor 1/(x y) \rfloor$ not equally distributed
mathoverflow.net

50
cube + cube + cube = cube
mathoverflow.net

49
On an example of an eventually oscillating function
mathoverflow.net

48
Is there a “classical” proof of this $j$-value congruence?
mathoverflow.net

46
the following inequality is true，but I can't prove it
mathoverflow.net

46
A conjectural closed form for $\sum\limits_{n=0}^\infty\frac{n!\,(2n)!}{(3n+2)!}$
math.stackexchange.com

45
Checkmate in $\omega$ moves?
mathoverflow.net

45
Are there infinitely many integer-valued polynomials dominated by $1.9^n$ on all of $\mathbb{N}$?
mathoverflow.net

45
Heuristically false conjectures
mathoverflow.net

44
Alternating sum of square roots of binomial coefficients
mathoverflow.net

44
Proofs where higher dimension or cardinality actually enabled much simpler proof?
mathoverflow.net

43
Can any group be embedded in a simple group?
mathoverflow.net

40
How to decide this function takes integer values?
mathoverflow.net

40
A question on maps from $\mathbb{Z}/p\mathbb{Z}$ to itself
mathoverflow.net

39
What is the name of the 65537-gon?
mathoverflow.net

39
Does $(x^2 - 1)(y^2 - 1) = c z^4$ have a rational point, with z non-zero, for any given rational c?
mathoverflow.net

37
Is there a way to write an infinite set that contains only irrational numbers without integer multiples?
math.stackexchange.com

37
Which high-degree derivatives play an essential role?
mathoverflow.net

37
Contest problems with connections to deeper mathematics
mathoverflow.net

37
The function $\sum_{0}^{\infty} x^n/n^n$
mathoverflow.net

37
Is there any sequence $a_n$ of nonnegative numbers for which $\sum_{n \geq 1}a_n^2 <\infty$ and $\sum_{n \geq 1}\left(\sum_{k \geq 1}\frac{a_{kn}}{k}\right)^2=\infty$?
mathoverflow.net

36
Is there anything special about the Riemann surface $y^2 = x(x^{10}+11x^5-1)$?
mathoverflow.net

1 2 3 4 5 … 10