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abacaba
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Top posts
question
11
Number of triangle-free graphs with prescribed number of edges
Dec 4, 2022
answer
6
Series convergence if $\sum a_n^2 < \infty$
Nov 30, 2023
question
4
"JigSaw Puzzle" on Set Family II
Mar 12, 2023
question
4
A question about the existence of surjective contractions
Nov 27, 2023
question
2
Covering base sets $X$ with a subset family satisfying a "partial covering property"
Mar 29
answer
2
Does an $(x, bx)$-biregular graph always contain a $x$-regular bipartite subgraph?
Feb 18, 2022
question
0
"JigSaw Puzzle" on Set Family
Mar 12, 2023
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28
Do we have $\sum_{n=1}^{\infty}\frac{\gcd\left(1+n!,1+n^{2}\right)}{n!}\stackrel{?}{=}e$?
23
Summation of a subset of numbers from given intervals.
17
Conjecture: If $n$ is an odd positive integer then $\gcd\left(2^{n}+5,5^{n}-3^{n}\right)=1$.
16
Which is bigger, ${\sqrt2}^9$ or $9^{\sqrt2}$? (no calculator)
16
Intuition is silent: Find the probability that the smallest circle enclosing $n$ random points on a disk lies completely on the disk, as $n\to\infty$.