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Cauchy’s theorem for triangles	hbghlyj 2022-9-10 21:28	135	hbghlyj 2022-9-10 22:59
fun topological spaces	hbghlyj 2022-9-4 02:59	031	hbghlyj 2022-9-4 02:59
There is a connected subset of $𝐑^2$ which is not path-connected.	hbghlyj 2022-8-21 21:36	146	hbghlyj 2022-9-4 02:50
[数论] EGMO 7 Problem 6	hbghlyj 2022-8-26 15:37	066	hbghlyj 2022-8-26 15:37
[几何] 帶狀群 (Frieze group)	hbghlyj 2022-5-4 03:37	281	hbghlyj 2022-8-26 14:34
the Cantor set is an uncountable set with zero measure	hbghlyj 2022-8-25 01:58	135	hbghlyj 2022-8-25 01:58
Cauchy-Hadamard formula	hbghlyj 2022-8-24 03:00	148	hbghlyj 2022-8-24 03:04
学前教育	hbghlyj 2022-8-21 08:22	043	hbghlyj 2022-8-21 08:22
[几何] Möbius maps preserve circlines	hbghlyj 2022-8-9 10:20	985	hbghlyj 2022-8-18 07:26
Geometry of Cubic Polynomials (Xavier Boesken)	hbghlyj 2022-8-14 15:12	281	hbghlyj 2022-8-16 02:38
[函数] Identity of a conditional symmetric polynomial	tommywong 2022-8-14 19:46	061	tommywong 2022-8-14 19:46
[几何] A property of K024 (Problemas-de-Geometría 334)	hbghlyj 2022-8-14 07:54	051	hbghlyj 2022-8-14 07:54
[数论] Proth's Theorem	hbghlyj 2022-6-30 06:55	6148	hbghlyj 2022-8-13 02:49
prove $\frac{f(x)}{x}$ is uniformly continuous in $[1,\infty]$	hbghlyj 2022-8-13 02:10	035	hbghlyj 2022-8-13 02:10
[函数] $x⁵-6x+3∈ℚ[x]$ is not solvable by radicals.	hbghlyj 2022-7-13 03:56	3125	hbghlyj 2022-8-10 13:39
[组合] 通过计算概率证明存在性	hbghlyj 2022-3-17 18:36	7206	Czhang271828 2022-8-9 21:26
[几何] stereographic projection	hbghlyj 2022-7-18 01:23	2110	hbghlyj 2022-8-8 12:12
[组合] Inclusion–exclusion principle	hbghlyj 2022-6-27 03:19	481	Czhang271828 2022-8-6 21:43
[组合] chromatic index of $K_6$	hbghlyj 2022-4-15 12:24	1135	Czhang271828 2022-8-6 21:11
[组合] Counting Two Ways	hbghlyj 2022-3-18 00:11	4237	Czhang271828 2022-8-2 20:04
Radicals and units in Ramanujan's work	hbghlyj 2022-8-2 11:31	050	hbghlyj 2022-8-2 11:31
[函数] Bolzano's Continuous but Nowhere Differentiable Function	hbghlyj 2022-8-1 22:49	255	hbghlyj 2022-8-2 00:33
[数论] Norm and Trace of an algebraic number	hbghlyj 2022-6-18 17:41	269	Czhang271828 2022-7-29 17:00
[几何] 用扇形覆盖定长曲线	hbghlyj 2022-7-26 20:57	156	hbghlyj 2022-7-26 21:26
[几何] $\Bbb R^n$中的$n+1$条射线的夹角全都相等	hbghlyj 2022-7-20 20:08	358	hbghlyj 2022-7-20 20:41
[函数] $\cos\big(π\frac i{2n+1}\big)$连乘积	hbghlyj 2022-7-19 19:00	061	hbghlyj 2022-7-19 19:00
[几何] Compass Geometry	hbghlyj 2022-7-17 06:08	975	hbghlyj 2022-7-18 00:49
[数列] the number of distinct real spectra for an orthogonal $n×n$ matrix	hbghlyj 2022-7-16 00:53	172	hbghlyj 2022-7-16 02:54
[函数] Suppose $\|A\|=n,f:A→A$ is injective $\implies∃k∈[n]:f^k(x)=x$	hbghlyj 2022-7-12 03:20	054	hbghlyj 2022-7-12 03:20
[函数] L'Hôpital's rule, $\lim g'$ non-exist, cancellation in $f'/g'$ can cause error	hbghlyj 2022-6-19 20:22	159	hbghlyj 2022-6-19 20:35

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