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YuiTo Cheng
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Wir müssen wissen, wir werden wissen

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Top Posts (17) 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
9 Packing regular tetrahedra of edge length 1 with a vertex at the origin in a unit sphere Jan 4
5 Avoiding choice in proving “Sequential compactness implies Lebesgue Number Lemma” yesterday
5 How to prove there exists an uncountable well-ordered set without using axiom of replacement Jul 9 '18
5 A list of Rudin-style textbooks Dec 20 '18
3 Categorical introduction to Algebra and Topology Dec 21 '18
3 Possible use of choice in proving “Compactness implies limit point compactness” Jan 18
2 Theorems in the form of “if and only if” such that the proofs of BOTH directions are nontrivial Jan 11
2 Is there a notion that quantify the dependence of a proof on AC? yesterday
2 Is $\mathbb{R}^\omega$ endowed with the box topology completely normal (or hereditarily normal)? Dec 14 '18
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