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Mathematics
Paolo Leonetti's user avatar
Paolo Leonetti's user avatar
Paolo Leonetti's user avatar
Paolo Leonetti
  • Member for 11 years, 10 months
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  • Italy
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answer
39
Understandable questions which are hard for non-mathematicians but easy for mathematicians
Feb 28, 2018
question
30
A subadditive bijection on the positive reals
Jun 21, 2018
question
23
Is it possible to cover $\{1,2,...,100\}$ with $20$ geometric progressions?
Aug 5, 2015
question
21
Finding all integer solutions of $5^x+7^y=2^z$
Apr 1, 2013
question
21
For all $n$ there exists $x$ such that $\varphi(x)<\varphi(x+1)<\ldots<\varphi(x+n)$
Aug 15, 2015
answer
15
If $\lim_{n\to\infty} x_{n+1}-\frac12 x_n = 0$ then $x_n\to 0$
Aug 22, 2015
answer
15
Solve three equations with three unknowns
Jun 28, 2017
answer
14
Does the sequence $x_0=8$ , $x_{n+1}=4x_n+1$ contain a prime?
Mar 25, 2018
question
14
Is there any $F \in \mathscr{F}$ such that $\mu(F)=x$?
Aug 15, 2015
question
13
Zero joint subsums of integers
Jun 6, 2017
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13
Gambler's ruin: The fair game is the longest
10
Does a monotone subadditive $f: \mathcal{P}(\bf N)\to [0,1]$ admit a finite partition with values in $(0,1)$?
10
Independent families on $\omega$ with an additional splitting property
8
A vertical line with many intersections with $n$ non-parallel lines
7
An open set which is not the union of a closed set and a countable set