作者查詢 / WINDHEAD
作者 WINDHEAD 在 PTT [ Math ] 看板的留言(推文), 共560則
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1F推:我以前在板上證過一個稍微複雜的版本，就是F裡面07/03 18:17
2F→:同時有x,t的公式 好像被系統刪了？07/03 18:17
7F→:哈因為foward rate是用積分來表示的關係嗎07/03 21:52
8F→: forward XD07/03 21:53
10F推:正確念法是 Detroit06/21 18:39
3F推:sigma 裡面的 n 和題目的n 是不同的 n06/11 16:04
1F推:你右邊的a,b,c有點亂,不過沒關係,這個更簡單,因為05/17 08:13
2F→:A‧B x C 就是A,B,C三向量張成的平行六面體體積,05/17 08:13
3F→:可以寫成 det[A,B,C] <-- 矩陣裡面放 A,B,C05/17 08:14
4F→:A,B,C放成row a,b,c放成column, 那你的恆等式就是05/17 08:14
5F→: 兩個行列式相乘 = 矩陣先相乘再取行列式05/17 08:15
1F推:你右邊的a,b,c有點亂,不過沒關係,這個更簡單,因為05/17 08:13
2F→:A‧B x C 就是A,B,C三向量張成的平行六面體體積,05/17 08:13
3F→:可以寫成 det[A,B,C] <-- 矩陣裡面放 A,B,C05/17 08:14
4F→:A,B,C放成row a,b,c放成column, 那你的恆等式就是05/17 08:14
5F→: 兩個行列式相乘 = 矩陣先相乘再取行列式05/17 08:15
1F推:請洽 xcycl05/09 23:33
1F→: f(z)=(-i)(1+z)/(1-z) 把上半圓映為正實數軸的說04/17 11:01
3F→:如果無窮遠點不管的話,那把f(z)平方就好04/17 13:33
4F推:呃 你可能會問說無窮遠點怎麼辦 那就再用 1/(1+z)04/17 13:49
5F→:作一次, 總之最後答案是 -(1-z)^2/4z04/17 13:49
7F→:被樓上秒殺了阿04/18 01:04
18F→:這有很多種作法,以單純的 1/x 在[-1,1]積分來說04/17 00:04
19F→:你取小半圓會得到 -i\pi ,那如果取principle value04/17 00:05
20F→:的話會得到零,因為正負的部份抵消了04/17 00:05
22F推:我的意思是這有很多種作法XDDDD04/17 01:03
26F推:知道自己在幹嘛就好04/17 12:21
4F→:方向可以用sheaf來描述,更精確地說,是dualizing04/16 02:09
5F→:complex 在適當維數的上同調sheaf (被毆飛~~)04/16 02:10
1F推:冪級數"在哪裡"展開事關重大,如果在原點展開則是03/26 02:15
2F→:像你說的公比 0.5x03/26 02:16
3F→: -03/26 02:16