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[其他] frechet derivative的方向怎麼選?

[ Math ]18 留言, 推噓總分: +2

作者: peter308 - 發表於 2021/10/23 00:09(2年前)

3^F→peter308: 我大概知道原因了在我的例子中方向其實是在張量10/23 01:33

4^F→peter308: 空間中所定義的如果張量是二階那小變量自然也是二10/23 01:34

5^F→peter308: 階張量也就會是一個矩陣!10/23 01:34

6^F→peter308: 其實要看所處的空間是個幾階張量那方向自然也會是10/23 01:35

7^F→peter308: 對應的"張量空間"10/23 01:36

10^F→peter308: 是Frechet derivative 有文章也有程式碼10/25 11:49

11^F→peter308: A key requirement of the definition of Fréchet10/25 14:14

12^F→peter308: L(X,E) must satisfy the defining equation for al10/25 14:15

13^F→peter308: all E. This is what makes the Fréchet derivativ10/25 14:15

14^F→peter308: ve different from the Gâteaux derivative (or10/25 14:15

15^F→peter308: directional derivative),10/25 14:16

16^F→peter308: https://nhigham.com/2020/06/23/what-is-a-frechet10/25 14:16

17^F→peter308: -derivative/10/25 14:16

18^F→peter308: 不過我發現我還是不知道怎麼選小變量的方向 / \10/25 14:41

Re: [微積] 這個非齊性微分方程怎解?

[ Math ]5 留言, 推噓總分: +2

作者: Honor1984 - 發表於 2019/12/05 16:05(4年前)

1^F推peter308: 感謝!!12/05 16:45

2^F→peter308: 所以會有兩個積分常數??12/05 16:46

3^F→peter308: 是否意味必須有兩個邊條件?12/05 16:46

[其他] 這邊有人對於"持續同調"方法熟的嗎??

[ Math ]6 留言, 推噓總分: 0

作者: peter308 - 發表於 2019/01/09 11:15(5年前)

3^F→peter308: 回1F 可能對數學本科的人很簡單,但我物理的覺得01/11 12:42

4^F→peter308: 至少要幾個月才能真正掌握所有相關背景知識和術語01/11 12:42

5^F→peter308: 但我自己覺得拓樸學非常有趣! 跟當初學電磁學的感01/11 12:43

6^F→peter308: 覺很接近常常需要做立體空間的思考!01/11 12:44

[幾何] 碎形和拓樸是研究類似性質的不同手段嗎?

[ Math ]5 留言, 推噓總分: +1

作者: peter308 - 發表於 2018/12/23 15:09(5年前)

4^F→peter308: 樓上s大請問你水球我是關於什麼事情? 我剛剛看到你12/23 20:59

5^F→peter308: 的水球已經斷線,不清楚是否有什麼問題要討論?12/23 20:59

Re: [分析] Zeta函數和Gamma函數的一些小知識

[ Math ]3 留言, 推噓總分: +1

作者: Lindemann - 發表於 2018/12/13 03:36(5年前)

1^F推peter308: 高手!12/13 16:56

[問題] 諾特定理能夠適用在非線性系統嗎??

[ Math ]13 留言, 推噓總分: 0

作者: peter308 - 發表於 2018/01/05 12:30(6年前)

12^F→peter308: 感謝樓上!01/05 15:32

13^F→peter308: 我再好好研究看看!01/05 15:38

[請益] 非線性分析有專門的課可以修嗎??

[ Math ]12 留言, 推噓總分: +1

作者: peter308 - 發表於 2017/12/20 10:43(6年前)

9^F→peter308: 感謝各位!12/22 10:41

Re: [微積] 怎麼積高斯函數???

[ Math ]4 留言, 推噓總分: +1

作者: wohtp - 發表於 2011/09/21 01:04(12年前)

1^F推peter308:為什麼第二行可以那樣?而且我的答案有error function09/21 16:44

2^F→peter308: 你的式子好相機出來是一個數字09/21 16:44

3^F→peter308:是不是要先把 d^3x=4pi x^2 dx d^3x'=4pi x'^2dx' ?09/21 16:45

4^F→peter308: 但會多出 (xx')^209/21 16:46

[微積] 怎麼積高斯函數???

[ Math ]5 留言, 推噓總分: +1

作者: peter308 - 發表於 2011/09/20 10:26(12年前)

2^F→peter308:樓上有參考資料嗎? 我想很久都想不出來很謝謝你09/20 15:27

3^F→peter308: 另外請問你是之前有算過還是你是自己想出來的?09/20 15:28

4^F→peter308:我代換變數了不過還是積不出來....會卡住09/20 16:23

5^F→peter308:有人可以幫我一下嗎?? 太久沒算數學了 QQ09/20 16:29

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