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YiFan

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Top posts (304) All Questions Answers | Votes Newest

20 Sigma notation for sum of $\ln(x)^2$ from $2$ to $20$ with steps of $0.5$ Feb 10
15 Why do early math courses focus on the cross sections of a cone and not on other 3D objects? Apr 19
15 Are all notation equal by derivatives? Jun 30
15 Unsolved Problems (Not Independent of ZFC) due to Lack of Computational Power Aug 18
14 Are these square matrices always diagonalisable? Apr 23
10 Solid Angle Trigonometry? Jan 29 '18
9 Is there a substitution which transforms every Fermat curve into an elliptic curve? Dec 17 '18
8 Showing $f(t) = t^4 + 2t^2 + 9$ is reducible over $\Bbb Q$ Apr 4
8 Almost normal subgroups: Is there any notion which is weaker than normal subgroup? Feb 21
8 Question about proving $\mathbb{Z}[i]$ is not UFD Mar 10
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