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[線代] AB = BA 的條件?

[ Math ]22 留言, 推噓總分: +10

作者: ntust661 - 發表於 2011/09/26 20:56(14年前)

4^F推profyang:可同時對角線化09/26 21:14

9^F推profyang:我印象中同時對角線化與commute好像是if and only if09/26 22:15

19^F推profyang:阿更正我講的那個應該是要方陣下才if and only if09/26 22:58

[線代] 矩陣積分

[ Math ]3 留言, 推噓總分: +2

作者: ntust661 - 發表於 2011/09/24 21:52(14年前)

2^F推profyang:感覺沒錯吧你把AB的每個entry用Σ寫出來好像就對了09/24 23:51

[轉錄]e^ix=cosx+isinx

[ Math ]8 留言, 推噓總分: +3

作者: Carrey - 發表於 2011/09/21 22:58(14年前)

9^F推profyang:設e^(ix)=f+ig=>ie^(ix)=f'+ig'=-g+if=>f'=-g g'=f09/21 23:13

10^F→profyang:可得f''=-f g''=-g代入起始條件e^(i*0)=1 ie^(i*0)=i09/21 23:15

11^F→profyang:可以得到f=cosx g=sinx09/21 23:15

[中學] 0的平方根

[ Math ]39 留言, 推噓總分: +9

作者: ArzasV - 發表於 2011/09/21 22:20(14年前)

19^F推profyang:x^2=0的解只有一個不是兩個並不是重根就是兩個09/21 23:45

[線代] Hoffman Ch8的問題

[ Math ]9 留言, 推噓總分: +4

作者: profyang - 發表於 2011/07/27 12:13(14年前)

2^F→profyang:一樓可以再說詳細一點嗎?@@感恩!!我當然知道要證明07/28 11:06

3^F→profyang:TU*=U*T and UT*=T*U, 只是我還是不知道如何下手07/28 11:07

6^F→profyang:喔喔我了解你的意思了你那樣是利用T*=f(T)07/29 11:52

7^F→profyang:f是多項式,但是這個結果仍然要在complex才成立...07/29 11:53

[線代] 請教Friedberg線代課本第7章定理7.2(a)

[ Math ]3 留言, 推噓總分: +2

作者: mankato - 發表於 2011/07/23 16:39(14年前)

1^F推profyang:primary decomposition THm?07/23 18:08

[微積] sin(x)的平方之積分

[ Math ]8 留言, 推噓總分: +5

作者: g56 - 發表於 2011/07/22 13:34(14年前)

8^F推profyang:怎麼可能不是無限大...你都有1/2那項了07/22 16:58

[幾何] divergence theorem 似乎不適用於 unbo …

[ Math ]13 留言, 推噓總分: +4

作者: asynchronous - 發表於 2011/07/19 00:09(14年前)

4^F推profyang:不是很懂你想表達什麼...你舉的例子是標準Divergence07/19 00:20

5^F→profyang:Thm不適用的例子,因為他在0函數沒有定義...07/19 00:20

6^F→profyang:不過電磁學裡通常是寫▽‧▽(1/r)=δ(r)就是了07/19 00:22

7^F推profyang:那不就是設一個很大的邊界去近似嗎?電磁學裡的07/19 00:26

8^F→profyang:Dirichlet problem(lapalace equation的唯一性)常常07/19 00:27

9^F→profyang:都是這樣處理的07/19 00:27

10^F→profyang:更正不應該說近似說取極限應該比較好07/19 00:28

11^F→profyang:上面打錯,應該是poisson equation07/19 00:28

[微積] 橢圓面績

[ Math ]11 留言, 推噓總分: +1

作者: driftseed - 發表於 2011/07/18 18:41(14年前)

11^F推profyang:那是橢圓參數式...而且u和及座標θ也不一樣07/19 00:41

[中學] 求最小值

[ Math ]13 留言, 推噓總分: +4

作者: sighofdevil - 發表於 2011/07/17 23:29(14年前)

4^F推profyang:我的想法跟樓上一樣耶~我用multiplier去算還是有三次07/18 01:44

5^F→profyang:式07/18 01:44

11^F推profyang:所以原PO認了吧XD說不定是題目出錯或你看錯之類的XD07/19 00:31

12^F→profyang:沒錯的話就乖乖解三次式吧~07/19 00:31

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