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Salvo Tringali's user avatar
Salvo Tringali's user avatar
Salvo Tringali
  • Member for 13 years, 5 months
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  • Shijiazhuang, Hebei, China
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Not all those who wander are lost.

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33
How Composite can $2^n-1$ be, infinitely often?
Oct 16, 2017
answer
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
answer
18
Sets that are not sum of subsets
Oct 31, 2021
question
17
An elementary proof that, for every fixed $n \in \mathbf N^+$, there are infinitely many primes $\equiv -1 \bmod n$
Apr 27, 2017
question
17
Do $X$ and $Y$ have the same cardinality if their families of finite subsets do?
Jul 2, 2023
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
Top Meta posts
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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?