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YuiTo Cheng

Wir müssen wissen, wir werden wissen

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Top Posts (72) All Questions Answers | Votes Newest

22 Numbers of distinct values obtained by inserting $+ - \times \div ()$ in $\underbrace{2\quad2 \quad2 \quad2\quad…\quad 2}_{n \text{ times}}$ Feb 20
20 How well-studied is origami field theory? Feb 18
14 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? Feb 21
12 A more natural solution to finding the general terms of a recurrence relation in $2$ variables Feb 19
12 Theorems in the form of “if and only if” such that the proof of one direction is extremely EASY to prove and the other one is extremely HARD [closed] Jan 11
10 Does $\triangle ABC$ exist such that $\triangle ABC \sim \triangle DEF$, with $D, E, F$ being the incentre, centroid, orthocentre of $\triangle ABC$? Feb 15
10 Let $S=\{p(x) \in \mathbb Z[X] :|p(x)| \leq 2^x, \forall x\in \mathbb N\}$. Prove $|S| < \infty$ Feb 22
9 Packing regular tetrahedra of edge length 1 with a vertex at the origin in a unit sphere Jan 4
8 A list of Rudin-style textbooks Dec 20 '18
7 Given $n$ circles of radii $r_1,r_2,…,r_n$ inseparable by straight lines, prove that they can be covered by a circle of radius $r_1+r_2+…+r_n$ Mar 9
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