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悠闲数学娱乐论坛(第3版)
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Higher math
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Last post
互信息非负
hbghlyj
2023-1-12
0
126
hbghlyj
2023-1-12 00:55
arctan(z)的奇点
hbghlyj
2023-1-10
4
225
hbghlyj
2023-1-11 20:47
PolyLog[z,-k]在1的留数
hbghlyj
2023-1-2
1
118
hbghlyj
2023-1-11 20:14
Schwarz–Christoffel mapping
hbghlyj
2022-11-29
1
161
hbghlyj
2023-1-11 01:20
把上半平面共形映照到单位圆盘
hbghlyj
2022-11-30
1
147
hbghlyj
2023-1-10 23:49
利用反函数导数公式的三阶非线性ODE
青青子衿
2018-11-25
4
952
Czhang271828
2023-1-10 22:07
critical points of plane autonomous system 2
hbghlyj
2023-1-10
1
174
hbghlyj
2023-1-10 06:20
critical points of plane autonomous system
hbghlyj
2023-1-10
1
160
hbghlyj
2023-1-10 05:57
$A^2-2AB+B^2=O\implies f_A=f_B$
Czhang271828
2023-1-9
1
128
Czhang271828
2023-1-9 19:56
$x^k∣m_A(x),k>⌈n/2⌉$, 则$A$无平方根
hbghlyj
2023-1-4
4
109
Czhang271828
2023-1-9 18:45
奇数阶$A$行列式为正，存在非零向量使二次型为正
abababa
2021-7-10
2
293
hbghlyj
2023-1-6 09:23
A半正定, B对称, 则tr(AB)/tr(A)介于B的特征值的上下界之间
hbghlyj
2023-1-6
0
115
hbghlyj
2023-1-6 09:16
$A,B$是$n$阶对称半正定矩阵，$tr(AB)\ge0$当且仅当$AB=0$
abababa
2020-3-4
9
1223
hbghlyj
2023-1-6 09:02
2阶偏导判别法，可否举出实例？
dodonaomik
2016-7-8
2
966
hbghlyj
2023-1-6 03:15
Gram-Schmidt Orthogonalization，有什么实际用处？
dodonaomik
2016-6-28
7
2044
hbghlyj
2023-1-6 02:55
百度上这个拉马努金公式是怎么来的
永远
2023-1-4
3
152
hbghlyj
2023-1-4 23:07
证明拉马努金等式
永远
2023-1-4
2
124
hbghlyj
2023-1-4 20:42
矩阵的平方根
hbghlyj
2023-1-4
3
113
hbghlyj
2023-1-4 18:51
ker T∩Im T={0}⇒V=ker T⊕Im T
hbghlyj
2023-1-4
1
115
hbghlyj
2023-1-4 07:14
rank(AᵀA)=rank(A)与长方形矩阵的逆
hbghlyj
2022-1-6
8
426
Czhang271828
2023-1-3 23:03
Sylvester rank inequality
hbghlyj
2023-1-3
0
110
hbghlyj
2023-1-3 21:40
矩阵A的特征值λ的几何重数=1, 则rank(A-λI)=n-1
hbghlyj
2023-1-3
1
115
hbghlyj
2023-1-3 21:11
存在全纯函数在一个边界点处无穷次可导且级数收敛半径为0
hbghlyj
2023-1-2
0
111
hbghlyj
2023-1-2 03:45
在等边三角形上的二重积分
hbghlyj
2022-12-30
0
123
hbghlyj
2022-12-30 23:01
无处可导的连续函数
hbghlyj
2022-2-12
3
264
hbghlyj
2022-12-30 05:48
f(x)=∑sin(nx)/n
hbghlyj
2022-12-30
0
163
hbghlyj
2022-12-30 05:33
Cantor的漏帳篷
hbghlyj
2022-12-30
0
161
hbghlyj
2022-12-30 01:53
整函数$f$,$f(x)\in\Bbb R\forall x\in\Bbb Z^+$,则$f$与取共轭可交换吗
hbghlyj
2022-12-28
4
149
abababa
2022-12-28 21:42
计算定积分的插值方法
hbghlyj
2022-12-15
2
242
TripleIntegrals
2022-12-28 16:48
1772 年欧拉是如何算出奇数立方的倒数和公式的？
TSC999
2022-12-24
5
280
TSC999
2022-12-28 08:48
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2025-4-21 01:47 GMT+8
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