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Saúl RM's user avatar
Saúl RM's user avatar
Saúl RM
  • Member for 3 years, 10 months
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99 Answers

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58 votes

How many square roots can a non-identity element in a group have?

34 votes
Accepted

Can an odd number of marbles jump to infinity?

33 votes
Accepted

What is the smallest set of real continuous functions generating all rational numbers by iteration?

22 votes
Accepted

The $9$th tetration of $-\sqrt2$

21 votes
Accepted

A property of even continuous functions on the sphere

20 votes
Accepted

A gerrymandering problem - can you always turn a tie into a landslide victory?

17 votes
Accepted

Is the topology generated by this weaker notion of a metric necessarily metrisable?

16 votes

Is there an analytic non-linear function that maps rational numbers to rational numbers and it maps irrational numbers to irrational numbers?

14 votes
Accepted

Can a smooth manifold be realised as the image of a smooth function?

14 votes
Accepted

Unlinked interlocking planar polygons

14 votes
Accepted

Group with a translation invariant ultrafilter

12 votes
Accepted

Is every rational sequence topology homeomorphic?

11 votes
Accepted

If $\mathcal{H}^{n-1}(E)=0$ then $\mathbb{R}^n\setminus E$ is connected

11 votes
Accepted

Min–max reversing bijections $f:\mathbb{N}\to\mathbb{N}$

11 votes
Accepted

Uncountable collections of distinct subsets of an interval (existence)

10 votes

Almost everywhere-periodic functions with many periods

10 votes
Accepted

For this continuous non differentiable function $f$ How to determine $\sup\{a\}$ s.t $\lim\limits_{h\to0}\frac{f(x+h)-f(x)}{h^\alpha}=0$ for all $x$?

10 votes
Accepted

Relationship between doubling constant of a metric space and of a metric measure space

9 votes
Accepted

Why is this space contractible?

9 votes
Accepted

Boundaries of subsets of simply-connected domains

9 votes
Accepted

Existence of an open convex set

9 votes

What is the minimum-curvature curve interpolating a given set of points in the plane?

9 votes
Accepted

If an initial value problem has a solution on $[0,a)$ for all $a>0$, will it have a solution on the whole $[0,\infty)$?

7 votes
Accepted

Inspired by a card game: finding a path through $[\mathbb{N}]^n$

7 votes
Accepted

For a closed Riemannian manifold $M$, must the set of points with non-unique closest points to a closed submanifold $S$ of $M$ be of 0 volume measure?

7 votes
Accepted

Does the homeomorphism have a non-negative or non-positive determinant?

7 votes
Accepted

Do non-zero derivatives imply tangent lines (and vice versa)?

7 votes
Accepted

Convergence of a sequence

7 votes
Accepted

Size of antichains in powerset of $\mathbb N$

7 votes
Accepted

Shrinking and expanding pairs in bijections $\varphi:\mathbb{N}\to\mathbb{N}$

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