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Top Questions
33
votes
On the polynomial $\sum_{k=0}^n\binom{n}{k}(-1)^kX^{k(n-k)}$
polynomials
factorization
combinatorial-identities
hilbert-function
asked Mar 28 '18 at 23:32
mathoverflow.net
21
votes
Amoebas escaping the prison
combinatorics
optimization
board-games
asked Nov 29 '20 at 2:06
puzzling.stackexchange.com
12
votes
A fraction puzzle
mathematics
no-computers
computer-puzzle
asked Nov 21 '20 at 19:08
puzzling.stackexchange.com
11
votes
Never mind… Just go AFAYC
enigmatic-puzzle
asked Nov 7 '19 at 18:59
puzzling.stackexchange.com
9
votes
Is an integral sum of periodic vectors always a sum of integral periodic vectors?
nt.number-theory
rt.representation-theory
linear-algebra
cyclotomic-fields
asked Sep 19 '19 at 23:37
mathoverflow.net
8
votes
How many people are there?
logical-deduction
game
asked Oct 6 '19 at 0:15
puzzling.stackexchange.com
8
votes
Average size of extreme points of convex hull of $N$ points
pr.probability
convex-geometry
asked Jun 20 '17 at 13:11
mathoverflow.net
7
votes
When is the local representation associated to an elliptic curve a Steinberg?
nt.number-theory
rt.representation-theory
elliptic-curves
automorphic-forms
asked Feb 16 '17 at 13:50
mathoverflow.net
6
votes
Two super-button calculator
mathematics
combinatorics
asked Nov 12 '19 at 17:49
puzzling.stackexchange.com
6
votes
A class of symmetric functions
co.combinatorics
generating-functions
closed-form-expressions
asked Nov 16 '19 at 23:33
mathoverflow.net
1
2
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Top Answers
23
Which person is telling the truth?
puzzling.stackexchange.com
23
A finite alternating sum
mathoverflow.net
21
The $2\pi$ in the definition of the Fourier transform
mathoverflow.net
20
Prime tree game
puzzling.stackexchange.com
19
Inverse of special upper triangular matrix
mathoverflow.net
18
Harmonic sums and elementary number theory
mathoverflow.net
16
Board with all 2020s
puzzling.stackexchange.com
15
The Blank Sudoku
puzzling.stackexchange.com
15
Prove that $x$ is an integer if $x^4-x$ and $x^3-x$ are integers.
math.stackexchange.com
13
Evaluate $\lim\limits_{n \to \infty}\frac{(-1)^n}{n!}\int_0^n (x-1)(x-2)\cdots(x-n){\rm d}x$
math.stackexchange.com
13
Happy $\pi$-day! Is it true that $\sum_{p \;\text{prime} } \frac{1}{{\pi}^p} < \pi -\lfloor \pi \rfloor$?
math.stackexchange.com
13
Is it true that $\sum_{k=m}^n\frac{\sigma(k)}k\not\in\mathbb Z$ for all derangements $\sigma\in S_n$ and $1\le m\le n$?
mathoverflow.net
13
Sudokus everywhere!
puzzling.stackexchange.com
12
Number of paths on $\mathbb Z^d$
math.stackexchange.com
11
Is it possible to split the natural numbers into a finite number of sets so that no pair of numbers within a set adds up to a square?
math.stackexchange.com
10
Evaluate the following integral $ \int_1^{\infty} \frac{\lbrace x\rbrace-\frac{1}2}{x} dx$
math.stackexchange.com
10
End(M) for cyclic R-module M is a commutative ring where R is a PID.
math.stackexchange.com
10
Colombian Sudoku
puzzling.stackexchange.com
10
A rectangle, a circle, and a triangle are drawn on a plane
puzzling.stackexchange.com
10
Connect Wall: “Who's that Pokémon?”
puzzling.stackexchange.com
10
To equip hand sanitizers
puzzling.stackexchange.com
9
The beginning of a factorial
puzzling.stackexchange.com
9
If $x_{n+1}= \frac{nx_{n}^2+1}{n+1}$ then $x_{n}=1$
mathoverflow.net
9
Partition of [3n] into summoids
mathoverflow.net
9
There at least 4 divisors of $n-1$ which do not divide $\phi(n)$ if $n$ is a composite of the form $6k+1$
mathoverflow.net
8
Prove that $x^3+2y^3+4z^3\equiv6xyz \pmod{7} \Rightarrow x\equiv y\equiv z\equiv 0 \pmod{7}$
math.stackexchange.com
8
Two button calculator part 2
puzzling.stackexchange.com
8
A bound of the harmonic series of squares.
math.stackexchange.com
8
Paying bills in Alphagonia
puzzling.stackexchange.com
8
Find the limit $\lim\limits_{n \to \infty} \frac {n!} {1 \cdot 3 \cdot 5 \cdots (2n-1)}.$
math.stackexchange.com
1
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