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Mathematics
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YuiTo Cheng

Wir müssen wissen, wir werden wissen

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Top Posts (28) All Questions Answers | Votes Newest

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
11 If composition of two functions $f,g$ is continuous, does that imply continuity of both $f$ and $g$? Feb 10
10 Does $\triangle ABC$ exist such that $\triangle ABC \sim \triangle DEF$, with $D, E, F$ being the incentre, centroid, orthocentre of $\triangle ABC$? 2 days ago
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
5 How to prove there exists an uncountable well-ordered set without using axiom of replacement Jul 9 '18
5 Avoiding choice in proving “Sequential compactness implies Lebesgue Number Lemma” Jan 19
5 Intuition behind a counterexample to $|A+A|\leq |A-A|$, where $A$ is a finite set 2 days ago
4 Methods of making mathematical discovery Feb 14
4 Collection of less well-known, non-trivial, elegant story proofs (ie, “double counting proofs”) of combinatorial identities yesterday
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