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Salvo Tringali's user avatar
Salvo Tringali's user avatar
Salvo Tringali
  • Member for 12 years, 9 months
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  • Shijiazhuang, Hebei, China
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33
How Composite can $2^n-1$ be, infinitely often?
Oct 16, 2017
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27
Sums of sets of lower density 0
May 6, 2015
question
21
Is there any non-commutative ring such that every element other than the identity is a zero divisor?
Jun 20, 2021
question
18
An elementary, short proof that the group of units of the ring of integers of a number field is finitely generated
Apr 16, 2017
question
17
Do $X$ and $Y$ have the same cardinality if their families of finite subsets do?
Jul 2, 2023
answer
17
Sets that are not sum of subsets
Oct 31, 2021
question
16
An elementary proof that, for every fixed $n \in \mathbf N^+$, there are infinitely many primes $\equiv -1 \bmod n$
Apr 27, 2017
question
14
The limit superior of $\varphi(2^n-1)/(2^n-1)$
Oct 18, 2017
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13
Every measure on a set $X$ extends to the power set of $X$: Consistent or not with ZF?
Jan 25, 2016
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13
Polynomials leaving invariant the Gaussian integers
Jul 24, 2017
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What is the policy on "shortening titles" on MO?
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Correspondences between Borel algebras and topological spaces
11
How to express in a diplomatic, but not too subtle, way that an old (and popular) notion should be dismissed in favor of a new (and better) one?
10
Proof skew-symmetric matrix $A$ exhibits $\vec{x}^T A \vec{x} = 0$
7
Locally Lipschitz implies Lipschitz under equivalent metrics?
5
Is there a name for this identity involving series?