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lulu
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88
Is it possible to find an infinite set of points in the plane where the distance between any pair is rational?
Oct 21, 2016
73
If $A+B=AB$ then $AB=BA$
Apr 19, 2017
57
On irrationality of natural logarithm
Feb 27, 2017
48
How to prove the following number theory puzzle
Oct 17, 2023
46
Drunk man with a set of keys.
Dec 4, 2016
42
How to prove that the Fibonacci sequence is periodic mod 5 without using induction?
Jul 12, 2015
40
Find three non-constant, pairwise unequal functions $f,g,h:\mathbb R\to \mathbb R$...
Jul 10, 2017
40
Product of all elements in finite group
Jul 8, 2015
37
Why is $0.63212$ the probability of a $\frac1n$-probability event happening in $n$ trials?
Aug 21, 2016
34
Is there any conjecture that has been proved to be solvable/provable but whose direct solution/proof is not yet known?
Aug 12, 2018
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How should questions tagged "solution-verification" be answered?
7
Closing a post with multiple duplicates