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25 votes

Numbers of distinct values obtained by inserting $+ - \times \div ()$ in $\underbrace{2\quad2 \quad2 \quad2\quad...\quad 2}_{n \text{ times}}$

combinatorics elementary-number-theory recurrence-relations arithmetic asked Feb 20, 2019 at 11:28
math.stackexchange.com

24 votes

How well-studied is origami field theory?

reference-request field-theory geometric-construction origami asked Feb 18, 2019 at 10:54
math.stackexchange.com

15 votes

Is there a group $G$ and subgroup $H$, such that there exists $g\in G$ with $gHg^{-1} \subset H$ and $|H:gHg^{-1}|$ is infinite?

abstract-algebra group-theory examples-counterexamples infinite-groups asked Feb 21, 2019 at 10:32
math.stackexchange.com

14 votes

A more natural solution to finding the general terms of a recurrence relation in $2$ variables

recurrence-relations contest-math alternative-proof asked Feb 19, 2019 at 14:08
math.stackexchange.com

14 votes

A list of Rudin-style textbooks

reference-request soft-question book-recommendation big-list asked Dec 20, 2018 at 7:41
math.stackexchange.com

13 votes

'Contravariance has more mathematical structure in it whereas covariance is more geometrical and easy to understand.' Is it a serious claim?

algebraic-topology category-theory functors asked Dec 18, 2020 at 6:12
math.stackexchange.com

12 votes

Does $\triangle ABC$ exist such that $\triangle ABC \sim \triangle DEF$, with $D, E, F$ being the incentre, centroid, orthocentre of $\triangle ABC$?

geometry euclidean-geometry triangle asked Feb 15, 2019 at 12:04
math.stackexchange.com

11 votes

Packing regular tetrahedra of edge length 1 with a vertex at the origin in a unit sphere

geometry spherical-geometry packing-problem asked Jan 4, 2019 at 7:40
math.stackexchange.com

10 votes

Packing regular tetrahedra of edge length 1 with a vertex at the origin in a unit sphere

mg.metric-geometry packing-and-covering asked Jan 5, 2019 at 6:00
mathoverflow.net

9 votes

Let $S=\{p(x) \in \mathbb Z[X] :|p(x)| \leq 2^x, \forall x\in \mathbb N\}$. Prove $|S| < \infty$

real-analysis analysis polynomials asked Feb 22, 2019 at 11:13
math.stackexchange.com

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