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Mathematics
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WhatsUp
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19
What is the meaning of the ideal class group?
Jan 4, 2022
19
Prove that $x$ is an integer if $x^4-x$ and $x^3-x$ are integers.
Nov 4, 2019
14
Cut a ribbon with a minumum amount of cuts (Middle School Math)
Nov 2, 2023
14
Evaluate $\lim\limits_{n \to \infty}\frac{(-1)^n}{n!}\int_0^n (x-1)(x-2)\cdots(x-n){\rm d}x$
Jul 4, 2020
12
Number of paths on $\mathbb Z^d$
Dec 15, 2019
12
End(M) for cyclic R-module M is a commutative ring where R is a PID.
Dec 19, 2019
12
Happy $\pi$-day! Is it true that $\sum_{p \;\text{prime} } \frac{1}{{\pi}^p} < \pi -\lfloor \pi \rfloor$?
Mar 14, 2020
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?
Feb 11, 2021
11
Interesting behavior of the $2$-tag system $\{a\rightarrow abc,b\rightarrow ab,c\rightarrow c\}$
Mar 12, 2021
10
Evaluate the following integral $ \int_1^{\infty} \frac{\lbrace x\rbrace-\frac{1}2}{x} dx$
Jul 26, 2020
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33
On the polynomial $\sum_{k=0}^n\binom{n}{k}(-1)^kX^{k(n-k)}$
27
Right-Turn-Only Maze
26
The "Loop of rope" dilemma
26
Which person is telling the truth?
25
The $2\pi$ in the definition of the Fourier transform